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Results 1051 to 1080 of 4099:

Pyrolysis of wheat and barley strawOriginal Paper

Anežka Sedmihradská, Michael Pohořelý, Petr Jevič, Siarhei Skoblia, Zdeněk Beňo, Josef Farták, Bohumír Čech, Miloslav Hartman

Res. Agr. Eng., 2020, 66(1):8-17 | DOI: 10.17221/26/2019-RAE

Pyrolysing agricultural crop residues and other biomass constitutes a newer method of transforming often difficult, waste materials into a novel type of soil amendment/additive. Simultaneously, this process also makes it possible to exploit part of the energy released in the agricultural production. Biochar, viewed as the solid product of biomass pyrolysis, is a remarkable, porous material, rich in carbon. Two agricultural crop residues, such as wheat and barley straw, were selected for the experimental studies. The results indicate that the practical temperature for the production of biochar from the two explored materials occurs in the vicinity of 600 °C. Starting at this temperature, the biochar produced complies safely with the principal European Biochar Certificate standards (EBC 2012). Thus, for the wheat straw and barley straw - originated char, the content of the carbon amounts to 67.2 and 67.0 mass %, the atomic ratio H : C is as large as 0.032 and 0.026, and the specific surface area amounts to 217 and 201 m2.g-1, respectively.

Exogenously spermidine alleviates damage from drought stress in the photosystem II of tall fescueOriginal Paper

Yu Liu, Chunxiang Hao, Guangyang Wang, Qian Li, An Shao

Plant Soil Environ., 2021, 67(10):558-566 | DOI: 10.17221/236/2021-PSE

Drought stress is one of the major limiting factors to crop productivity around the globe. It has been well documented that spermidine (Spd) plays an important key role in plant growth and development, especially in the defense response to stress. The objective of this study was to explore the effect of Spd on protecting photosynthetic apparatus in tall fescue under drought stress. Spd application significantly improved the OJIP (fluorescence rise kinetics O-J-I-P) curve compared to non-Spd application during drought. Exogenous Spd exhibited higher FJ (fluorescence value at the J-step (2 ms) of OJIP) and FP (maximal recorded fluorescence intensity, at the peak P of OJIP) than non-Spd application. Moreover, normalised total complementary area (Sm) and the number of QA (primary quinone acceptor of PS II) reduction events (N) significantly reduced after the application of Spd in tall fescue under drought stress. In terms of quantum yields and efficiencies and specific energy fluxes, exogenous Spd notably decreased the values of efficiency of electron transfer from QB (secondary quinone acceptor of PS II) to PSI acceptors (δR0), absorption flux per RC (ABS/RC) and trapping flux per RC (TR0/RC) compared to the non-Spd application without watering. All the above suggested that exogenous Spd facilitated the photosynthetic system of tall fescue in drought. These observations involved in the electron transport capacity of photosystem II assist in understanding better the protective role of exogenous Spd in tall fescue under drought stress.

An assessment of the wound healing potential of a herbal gel containing an Azadirachta indica leaf extractOriginal Paper

M Munir, SNH Shah, U Almas, FA Khan, A Zaidi, SM Bukhari, G Murtaza

Vet Med - Czech, 2021, 66(3):99-109 | DOI: 10.17221/46/2020-VETMED

The objective of this study was to produce a Carbopol 940 based gel formula containing an Azadirachta indica leaf extract and evaluate its wound healing potential. The ethanolic extract was derived from the dried leaves of Azadirachta indica and was subjected to a phytochemical evaluation. Three gel formulations of Carbopol 940 containing an Azadirachta indica extract in three different concentrations, i.e., 1, 2, and 3% w/w were prepared. These gels were evaluated for their physical appearance, stability, antimicrobial activity, extrudability, skin irritability, pH, spreadability, and viscosity. The prepared formulas were stable, greenish and homogeneous. None of them showed irritation to the skin. The spreadability (g.cm/sec), viscosity (cps), and pH of all three formulations was 34.68, 53 270-65 400, and 6-7, respectively. Gel-III exhibited the highest antimicrobial potential against E. coli and P. aeruginosa with a zone of inhibition of 16.2 ± 0.6 mm and 15.6 ± 0.6 mm, respectively. It was revealed from the wound healing studies that the epithelialisation time for the Albino rabbits treated with Gel-III was 23 days. The Albino rabbits treated with Gel-I, Gel-II, a standard gel, and those with the untreated one (control), epithelialised in 27, 25, 26, and 34 days, respectively. A formulation containing 3% w/w extract showed better antimicrobial activity, physicochemical characteristics, and pharmacological parameters than the other formulations. It can be concluded that the wound healing process was faster with the gel formulation containing 3% w/w of the Azadirachta indica extract, proposing that this formulation is a promising candidate for wound healing.

Wheat leaf rust (Puccinia triticina Eriks.) virulence frequency and detection of resistance genes in wheat cultivars registered in the Czech Republic in 2016-2018Original Paper

Alena Hanzalová, Veronika Dumalasová, Ondřej Zelba

Czech J. Genet. Plant Breed., 2020, 56(3):87-92 | DOI: 10.17221/86/2019-CJGPB

In 2016-2018 virulence of the Czech wheat leaf rust population was studied on Thatcher near-isogenic lines, carrying different Lr genes, and 130 leaf rust isolates. Virulence to Lr9 was found only sporadically. Virulence frequency to Lr2a, Lr2b, Lr2c and Lr28 was lower than in previous years. All tested isolates were avirulent to Lr19. Lr24 conditioned resistance to majority of isolates. Nineteen recently registered Czech cultivars were tested with six isolates of the pathogen and Lr genes were postulated. Presence of genes Lr1, Lr10, Lr19, Lr24, Lr26, Lr28, Lr34 and Lr37 was tested by molecular markers. Lr37 prevailed, followed by Lr genes 10, 24, 28, 1 and 26; genes Lr19 and Lr34 were not determined.

Electronic nose sensor development using ANN backpropagation for Lombok Agarwood classificationOriginal Paper

Farel Ahadyatulakbar Aditama, Lalu Zulfikri, Laili Mardiana, Tri Mulyaningsih, Nurul Qomariyah, Rahadi Wirawan

Res. Agr. Eng., 2020, 66(3):97-103 | DOI: 10.17221/26/2020-RAE

The aim of the present study is the development of an electronic nose system prototype for the classification of Gyrinops versteegii agarwood. The prototype consists of three gas sensors, i.e., TGS822, TGS2620, and TGS2610. The data acquisition and quality classification of the nose system are controlled by the Artificial Neural Network backpropagation algorithm in the Arduino Mega2650 microcontroller module. The testing result shows that an electronic nose can distinguish the quality of Gyrinops versteegii agarwood. The good-quality agarwood has an output of [1 -1], while the poor-quality agarwood has an output of [-1 1].

Growth and structure of pre-mature mixed stands of Scots pine created by direct seeding in the boreal zoneOriginal Paper

Aleksey Ilintsev, Darya Soldatova, Alexander Bogdanov, Sergey Koptev, Sergey Tretyakov

J. For. Sci., 2021, 67(1):21-35 | DOI: 10.17221/70/2020-JFS

The purpose of the research is to analyse the successful creation of an artificial pine forest by seeding and develop recommendations for the guaranteed reproduction of pine stands in Northern European Russia. In recent decades, there has been a steady decline in the share of pine stands and their replacement with low-value and low-yielding tree species. We surveyed 12 permanent sample plots that were laid out in various variants of forest crops. The taxation parameters were obtained by a standard analysis of the experimental data. The evaluation parameters of the stands vary within the following limits: the average diameter of the pine trees varied from 21.9 to 30.9 cm; the total basal area of the pine varied from 19.1 to 38.8 m2∙ha-1; the average height of the pine varied from 20.1 to 26.8 m; the number of growing trees varied from 754 to 1 952 ha-1; the pines varied from 382 to 762 ha-1; the growing stocks of stands varied from 416 to 608 m3∙ha-1. The distribution of pine trees by thickness steps showed that all the studied samples were close to the normal distribution curve. The results of the correlation and multidimensional analyses showed that the creation method of the forest crops had a significant impact on the value of the taxation parameters. It was found that the best options for growing pure pine stands that can be recommended for practical production are plots with a large share of soil cultivation and the size of the seedbed.

A study on the mathematical model for predicting the peel removal efficiency of a cassava peelerOriginal Paper

Charles Olawale Ogunnigbo, Dare Aderibigbe Adetan, Tunde Afolabi Morakinyo

Res. Agr. Eng., 2022, 68(1):18-26 | DOI: 10.17221/32/2021-RAE

A mathematical model for predicting the peeling efficiency of a cassava peeler was developed using a dimensional analysis based on Buckingham' s pi theorem. The model was validated using data from experimental studies which revealed a maximum coefficient of determination of R2 = 0.8366 between the measured and predicted values. The developed model proved appropriate in estimating the peel removal efficiency for a cassava peeler by up to 83.66%. There was no significance difference between the experimental and predicted values at a 0.05 significance level.

Identification of known leaf rust resistance genes in bread wheat cultivars from ChinaOriginal Paper

Xiaocui Yan, Takele-Weldu Gebrewahid, Rui Dong, Xing Li, Peipei Zhang, Zhanjun Yao, Zaifeng Li

Czech J. Genet. Plant Breed., 2021, 57(3):91-101 | DOI: 10.17221/6/2021-CJGPB

Leaf rust caused by Puccinia triticina Eriks. (Pt) is one of the most devastating fungal pathogens affecting wheat (Triticum aestivum L.) production worldwide. Deployment of resistant cultivars is the most environmentally friendly approach to control the disease. In this study, thirty-seven wheat lines from the Hubei and Shaanxi provinces in China were evaluated for seedling resistance in the greenhouse using eighteen Pt races. These lines were also tested for slow rusting resistance in the field in the 2014 to 2018 growing seasons. Eleven molecular markers closely associated with known Lr genes were used as part of the postulation process. Seven known Lr genes, 1, 13, 18, 14a, 26, 34 and 46 either singly or in combination were postulated in twenty-five cultivars. Lr1 and Lr26 were the most commonly identified genes detected in thirteen and ten cultivars, respectively. Lr13 and Lr46 were each found in four and five cultivars. Lr34 was present in three cultivars. Lr18 and Lr14a were identified in cultivar Xi'nong 538. Six cultivars displayed slow rusting resistance in the field tests. The resistant cultivars identified in the present study can be used as resistance parents in crosses aimed at pyramiding and the deployment of leaf rust resistance genes in China.

Energy and exergy analyses of okra drying process in a forced convection cabinet dryerOriginal Paper

Abiodun Okunola, Timothy Adekanye, Endurance Idahosa

Res. Agr. Eng., 2021, 67(1):8-16 | DOI: 10.17221/48/2020-RAE

A forced convection automatic cabinet dryer integrated with a data logger was designed and fabricated. The okra samples were dried in the dryer at drying temperatures of 50, 60, and 70 °C and at three different load densities of 200, 300, and 400 g at a continuous air velocity of 0.7 m.s-1. Energy and exergy analyses of the drying process were performed. The obtained results showed that the energy efficiency, energy utilisation, and utilisation ratio increased from 26.59 to 68.24%, 5.47 to 114.36 W, and 0.36 to 0.71 as the temperature increased to 70 °C, respectively. The inflow, outflow, and exergy losses were in the range of 7.02 to 26.14 W, 4.43 to 14.16 W, and 2.59 to 11.98 W, respectively, while exergy efficiency varied from 49.15 to 63.47%. The findings show that exergy efficiencies decrease with an increase in the drying temperature, but increase with a lower load rate. The index of sustainability varies from 2.14 to 2.77, the value increases as the load density decreases while it decreases with a temperature increment.

Effect of different dietary fibre sources on the zootechnical performance, feeding behaviour and intestinal physiology of growing and finishing pigsOriginal Paper

Josef Pichler, Florian Hemetsberger, Melanie Buchberger, Christiane Schwarz, Karl Schedle

Czech J. Anim. Sci., 2022, 67(1):15-26 | DOI: 10.17221/126/2021-CJAS

The aim of this study was to determine the effect of different sources of fibre in the diets of fattening pigs on performance, feeding behaviour and intestinal physiology. A total of 60 barrows and gilts (initial body weight 28.4 ± 0.4 kg) were allotted to four dietary treatments: control (CON), lignocellulose (LC), mycelium (MYC) and corn gluten feed (CGF). Diets were calculated to provide balanced available nutrient contents. Including MYC in the diet resulted in an increased average daily gain (P < 0.05) compared to CON and CGF, and improved gain to feed ratio (P < 0.05) compared to LC. Pigs in CON (P < 0.05) ate the fewest but largest meals, whereas treatment CGF (P < 0.05) showed the opposite effect, resulting in the same daily feeder occupation time. Regarding intestinal physiology, in ileum, no differences were observed between the contents of short chain fatty acids (SCFA), lactic acid and biogenic amines. In the colon, MYC showed an increased concentration of acetic acid (P < 0.05) as well as the total content of SCFA (P < 0.05), compared to LC and CGF. Distinct fermentation profiles of ammonia were recorded in ileal and colonic digesta, although contents remained below harmful concentrations. Morphometrical measurements showed differences between the fibre sources LC and MYC, as well as LC and the CON in all investigated gut sections. These results provide evidence that the inclusion of specific dietary fibre sources/contents can positively influence the gut morphology and performance of pigs. However, further studies are needed regarding the mode of action and physico-chemical characteristics of the different fibre sources as a precondition for their successful application in pig diets.

Silver nanoparticles improve growth and protect against oxidative damage in eggplant seedlings under drought stressOriginal Paper

Nadiyah M. Alabdallah, Md. Mahadi Hasan, Abdalrhaman M. Salih, S.S. Roushdy, Aisha S. Al-Shammari, Sumayah I. Alsanie, Mohamed El-Zaidy

Plant Soil Environ., 2021, 67(11):617-624 | DOI: 10.17221/323/2021-PSE

Drought stress is a significant abiotic stressor that has a negative impact on crop production and global food security systems. Drought stress was applied to eggplant seedlings with various field capacities (FC), 80% FC as control, 50% FC, 35% FC, and 20% FC. AgNPs were synthesised from green chemical methods, whereas different concentrations of AgNPs (0, 0.1, 0.2, 0.5 µmol) were applied exogenously on drought-stressed eggplants. Drought stress decreased the growth parameters (plant height, fresh mass, dry mass, leaf area), photosynthetic pigments (Chl a, Chl b, carotenoids), and protein content while increased the proline, hydrogen peroxide (H2O2), malondialdehyde (MDA) content, and activity of the antioxidant enzymes, i.e., superoxide dismutase (SOD) and catalase (CAT). AgNPs restricted proline accumulation and reduced H2O2, MDA content by upregulating the antioxidant enzymes. Overall, the current study's findings indicated that AgNPs are an effective eco-friendly and low-cost application for plant growth under drought stress, with the potential to mitigate the impact of drought on plants.

Association of sodium butyrate and phytase on the performance, bone quality and intestinal development in broilersOriginal Paper

Jonas Rodrigo Layter, Regina Buzim, Gustavo Fonseca, Juliana Schulter Schuroff, Lucas Pedro de Souza Glaeser, Jovanir Inês Müller Fernandes

Czech J. Anim. Sci., 2021, 66(9):368-380 | DOI: 10.17221/184/2020-CJAS

This study assessed the effect of the combination of microencapsulated sodium butyrate (SB) and phytase (PH) on the performance, intestinal integrity, and bone development of broilers. The experiment comprised 736 chicks distributed in a completely randomised design in a 2 × 2 factorial scheme (with and without the inclusion of SB and with the inclusion of PH at the recommended dose and superdosing) totalling four treatments and eight repetitions of 23 birds each. SB was added at 0.750 kg/tonne and PH was included at 750 phytase units (FTU)/kg and 1 500 FTU/kg of diet. The live weight (LW), feed intake (FI) and feed conversion (FC) were evaluated weekly. Bone measurements of the tibia and femur, densitometry, length, the Seedor index, and diameter were performed at seven and 28 days. In the same ages, fragments of the jejunum and ileum segments were collected and subjected to a morphometry analysis. At seven days of age, the birds supplemented with the phytase superdosing showed a better FI and LW, and the microencapsulated SB in the diet showed a better LW and FC. In the period from one to 28 days, the treatment supplemented with SB provided a higher FI and LW. The SB supplementation resulted in greater bone measurements at seven and 28 days. The use of the superdosing phytase increased the villus length and width of the jejunum at seven days and at 28 days. There was an increase in the villus length, villus-to-crypt ratio, absorption area, and muscular layer of the jejunum and a decrease in the crypt width of the jejunum. The SB supplementation increased the ileum crypt width at seven days and there was no effect on any intestinal segment at 28 days. The supplementation of SB or PH 1 500 FTU/kg in the broiler diets' growth promoter or antibiotic-free resulted in a better performance and bone measurements, while the association of the additional PH 1 500 FTU/kg and SB supplementation resulted in the greater depth and width of the jejunum crypt and villus : ileum crypt at seven days and greater villus length and ileum absorption area at 28 days. The association of SB and PH may be a strategy to improve the performance and bone quality and intestinal integrity in broilers.

Causes of spontaneous death and euthanasia in dogs: A background study in Bahia, BrazilOriginal Paper

JL Freitas, TS Andrade, EF Martins Filho, CS D'Soares, ACSN Souza, AWO Silva, PV Leal, TC Peixoto

Vet Med - Czech, 2021, 66(4):156-166 | DOI: 10.17221/92/2020-VETMED

Understanding the causes of death in dogs enhances the diagnostic capabilities of veterinarians, as well as reduces animal mortality. Studies on this topic assist in the control and prophylaxis of epidemics and in structuring public health programmes. In total, 1 355 necropsy reports of dogs filed at the Veterinary Pathology Laboratory of the Federal University of Bahia, Northeast, Brazil (2005-2017) were analysed. The epidemiological information and anatomopathological diagnoses were obtained. The diagnosed diseases were classified into 10 categories. The frequency of the zoonoses, the overall age of the death (AD) of the dogs, and the AD of the dogs for each disease category were determined. Infectious and parasitic diseases were the most frequent primary causes of death in puppies (44.62%) and adult dogs (26.52%). In elderly dogs, most deaths occurred due to neoplasms (42.37%). Distemper (10.46%) was the most prevalent condition. A high frequency of zoonoses (6.12%) and a high death rate caused by diseases that could have been prevented (15.06%), such as distemper, parvovirus and canine visceral leishmaniasis, were reported. The AD in the population studied was eight years. The results confirmed the hypothesis of a high death rate in dogs in the state of Bahia, Northeast, Brazil, because of preventable infectious diseases.

Isolation of Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus from nature: Technological characterisation and antibiotic resistanceOriginal Paper

Hakan Tavsanli, Tülay Elal Mus, Figen Cetinkaya, Ergün Ayanoglu, Recep Cibik

Czech J. Food Sci., 2021, 39(4):305-311 | DOI: 10.17221/296/2020-CJFS

Yoghurt fermenting bacteria were isolated from natural sources including plants, dew, and rain samples (total of 300 samples) by the same methods nomadic peoples used for several centuries in Turkey. Inoculation into the reconstituted skim milk followed by planting on specific media and matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF MS) analysis allowed for the identification of 18 Lactobacillus delbrueckii subsp. and 26 Streptococcus thermophilus. A multiplex polymerase chain reaction (PCR) assay applied to lactobacilli enabled the identification of 5 isolates as L. delbrueckii subsp. bulgaricus. The isolates showed a varying range of acidification rates and proteolytic activity in reconstituted skimmed milk (RSM). S. thermophilus isolates showed a broader range of resistance and the most frequent resistance was observed for streptomycin (69.2%), gentamycin (65.3%), clindamycin (61.5%), ampicillin (61.5%), kanamycin (53.8%), and erythromycin (50%). For L. delbrueckii subsp. the highest resistance was determined for vancomycin (38.8%), ciprofloxacin (33.3%), and penicillin (27.8%). The frequency of multiple resistance was tested on 14 different antimicrobials determining that 19 S. thermophilus (73%) and 3 L. delbrueckii subsp. (16.7%) demonstrated resistance to more than three different antibiotics. In contrast to this wide-ranging resistance, five isolates from each genus were found to be susceptible to all tested antibiotics. The present study indicates that lactic acid bacteria (LAB) isolated from nature may have broad-range of resistance to antibiotics and could be a source for the transfer of resistance.

Mapping of quantitative trait loci for purple stigma and purple apiculus in rice by using a Zhenshan 97B/Minghui 63 RIL populationOriginal Paper

Jiping Tong, Zhengshu Han, Aonan Han

Czech J. Genet. Plant Breed., 2021, 57(3):113-118 | DOI: 10.17221/20/2021-CJGPB

Anthocyanin pigmentation is an important morphological marker that is commonly used to identify rice varieties and for linkage analysis. The following study investigates the genetic factors involved in the purple stigma (Ps) and purple apiculus (Pa) traits of an important indica rice cross between Zhenshan 97 (purple stigma and purple apiculus) and Minghui 63 (grey stigma and colourless apiculus). A recombinant inbred line (RIL) population derived from this cross was used for quantitative trait loci (QTL) mapping of the purple stigma and purple apiculus traits. As a result, one major QTL for the purple stigma trait, temporarily designated qPS-1-1, and one major QTL for the purple apiculus trait, temporarily designated qPA-1-1, were mapped to the short arm of chromosome 6 in the interval between the two markers Y4073L and *P. The LOD peaks of qPS-1-1 and qPA-1-1 were 44.0127 and 173.3585, respectively. In addition, qPS-1-1 and qPA-1-1 explained 66.7416% and 98.6441% of the total phenotypic variance, respectively. The Zhenshan 97 allele increased the purple stigma trait by approximately 8.0355% (for qPS-1-1) and 9.8863% (for qPA-1-1). Moreover, since qPS-1-1 and qPA-1-1 were strongly correlated, they were also located in the same vicinity of the C gene on the short arm of chromosome 6, which suggested that the two QTL might be the same. By comparing these and previous results, it was deduced that qPS-1-1 or qPA-1-1 was the C gene and was pleiotropic for both the colouration of the apiculus and the colouration of the stigma in rice.

The perception of an image of the state forest enterprise by general public in chosen region of the Slovak RepublicOriginal Paper

Daniel Halaj, Klára Báliková, Yvonne Brodrechtová

J. For. Sci., 2022, 68(1):26-34 | DOI: 10.17221/129/2021-JFS

This paper deals with the comparison of the general public perception and the opinion of state forest managers on image of the state forest enterprise. The research was organised during the period 2015-2019. One group of respondents involved all managers of 23 sub-enterprises of state forest enterprise Lesy SR. The other group consisted of 384 respondents representing the general public residing in the Banská Bystrica region. Structured questionnaire with one open and 16 closed questions was applied for data collection with a help of electronic means. Collected data were processed with descriptive (particularly frequency analysis) and two-dimensional statistical methods. The results of the image inquiry aimed at three issues: (i) perceptions of the forest management effectiveness of the state versus non-state forest enterprises, (ii) perception of marketing strategy and its tools of the state forest enterprise, and (iii) comparison between public awareness/experience with public relations activities of the state forest enterprise.

Trichoderma asperellum improves soil microenvironment in different growth stages and yield of maize in saline-alkaline soil of the Songnen PlainOriginal Paper

Jian Fu, 3, Yao Xiao, Zhihua Liu, Yifei Zhang, Yufeng Wang, Kejun Yang

Plant Soil Environ., 2020, 66(12):639-647 | DOI: 10.17221/456/2020-PSE

The Songnen Plain is an important agricultural base in China and one of the important areas of distribution of saline-alkaline soils in the cold region. Saline-alkaline soils severely restrict maize growth. This study was to potentially promote the soil nutrient in the maize rhizosphere, microbes diversity, and maize yield by Trichoderma asperellum in saline-alkaline soil of the cold region. In the present study, we applied different amounts of T. asperellum in field experiments for three consecutive years. High-throughput sequencing was used to analyse the impact of Trichoderma on microbes diversity in maize rhizosphere soils. Changes in crop yield and soil nutrients were also monitored. T. asperellum treatment significantly increased the relative abundance of beneficial microbes genera. In the control treatment, the pathogenic microbes were the dominant genera. Pearson's correlation analysis revealed that changes in the soil microbial community composition were closely related to soil nutrients and were highly correlated with T. asperellum treatment concentration. Further, T. asperellum treatment increased crop yield by 4.87-20.26%. These findings suggest that T. asperellum treatment optimised the microenvironment of the maize rhizosphere soil, alleviated microbial community degeneration in cold region saline-alkaline soil, and promoted maize growth.

Effect of sprayer parameters and wind speed on spray retention and soil deposits of pesticides: Case of artichoke cultivarOriginal Paper

Hassouna Bahrouni, Hanene Chaabane, Nidhal Marzougui, Sana Ben Meriem, Houcine Bchini, Mohamed Ali Ben Abdallah

Plant Protect. Sci., 2021, 57(4):333-343 | DOI: 10.17221/29/2021-PPS

Irrational use of chemical method for crop protection, presents increasingly serious risks for human health and the environment. Droplet size and meteorological parameters are key factors to both environmental contamination and pest control efficacy. The objective of this study is to assess the impact of the nozzle use parameters, the operating pressure and the wind speed on droplet foliage deposition (retention) and soil deposition (losses), when treating artichoke. Several combinations were tested in a wind tunnel and in the field, under Mediterranean microclimatic conditions, using a fluorescent dye as a substitute for pesticide. Multiple regression models were built from tunnel data to predict foliage deposition and soil deposits, with determination coefficients of 0.96. Thus, models are able to simulate pesticide deposition on artichoke leaves and soil deposition, depending on sprayer parameters and wind speed. Foliage deposition and soil deposits rates ranged from 30 to 52% and 26 to 57% respectively for anti-drift nozzle. For conventional nozzle, rates varied from 20 to 38% and 31 to 62%. To improve retention and reduce spray losses, it is recommended to choose a medium droplet size when using an anti-drift nozzle, in conjunction with medium nozzle size, medium pressure and reduced wind speed.

A comprehensive study of canine parvoviruses (Carnivore protoparvovirus 1, Carnivore bocaparvovirus 1 and 2) from shelter dogs in TurkeyOriginal Paper

H Isidan, T Turan

Vet Med - Czech, 2021, 66(10):423-430 | DOI: 10.17221/130/2020-VETMED

A total of 150 rectal swab samples were collected from diarrheic dogs from the Sivas Municipal Animal Shelter, Turkey in April 2018. While 127 faecal samples were gathered from adults, 23 samples were collected from puppies. Canine parvovirus type 2 (Carnivore protoparvovirus 1), Canine minute virus (Carnivore bocaparvovirus 1) and Canine bocavirus (Carnivore bocaparvovirus 2) were examined by PCR with three sets of novel primers. Some of the amplicons were subjected to molecular sequencing and molecular analysis. Three faecal (2.36%) samples were found to be positive for Carnivore protoparvovirus 1, five faecal samples (3.94%) were found to be positive for Carnivore bocaparvovirus 1 and three samples (2.36%) were found to be positive for Carnivore bocaparvovirus 2 among 127 adult dogs. On the other hand, 14/23 faecal samples (60.87%) were found to be positive for Carnivore protoparvovirus 1, 8/23 faecal samples (34.78%) were found to be positive for Carnivore bocaparvovirus 1, and 6/23 faecal samples (26.09%) were found to be positive for Carnivore bocaparvovirus 2 from the puppies. Moreover, we detected two distinct clades of Carnivore bocaparvovirus 1 and 2 according to the molecular analysis. To the best of our knowledge, this is the first report for the direct detection of Carnivore bocaparvovirus 1 and 2 in Turkey.

Long-term application of pig manure fertiliser affects wheat yield and soil microorganism compositionOriginal Paper

Yan Li, Zishuang Li, Lei Ma, Lingfei Zhang, Xiaolin Zhou, Hongjie Li, Jianlin Wei, Fuli Zheng, Deshui Tan

Plant Soil Environ., 2023, 69(8):374-386 | DOI: 10.17221/132/2023-PSE

However, its underlying mechanism remains largely undetermined. In this work, we examined the impacts of the continuous application of pig manure fertiliser for 10 years on wheat yield in the calcaric fluvisol soil with a texture of sandy loam, and the relationship between soil microbial community composition and soil properties was also analysed. The wheat yield, yield components and wheat biomass were analysed by collected aboveground part. Soil nutrient, enzymatic activity and microorganism compositions were analysed by collected soil samples at the filling stage. The results showed that long-term application of pig manure fertiliser could remarkably increase wheat yield by improving soil nutrient availability, enzyme activities, and microbial composition. Moreover, soil pH, nitrogen content, dehydrogenase and urease were closely related to the soil microbial diversity. In conclusions, the long-term application of pig manure in combination with term mineral fertiliser could optimise microbial community composition by regulating the interaction between microbial species and enhancing soil enzyme activity and soil fertility, leading to increased wheat yield.

Evaluation of Streptococcus species isolated from subclinical sheep mastitis by molecular methods and determination of virulence factors and antimicrobial resistance genesOriginal Paper

V Ozavci, HT Yuksel Dolgun, S Kirkan, Y Seferoglu, Z Semen, U Parin

Vet Med - Czech, 2023, 68(9):359-367 | DOI: 10.17221/42/2023-VETMED

Streptococcus (S.) species are important pathogens that cause mastitis in sheep. The study aimed to examine Streptococcus species in sheep milk with subclinical mastitis, assessing their prevalence, antimicrobial resistance, and virulence genes. A total of 200 milk samples were collected from sheep farms in İzmir’s five districts. Out of 32 (28.6%) Streptococcus isolates identified by phenotypic methods, 25 were genotypically identified as S. uberis, 5 as S. agalactiae, and 2 as S. dysgalactiae. Disk diffusion was used to determine the antimicrobial resistance of the isolates. PCR was employed to identify antimicrobial resistance and virulence genes in the isolates. The highest resistance was found for cloxacillin (100%), and the highest sensitivity was found for florfenicol (84%). The most common resistance gene combination was tetM+tetS (3/32) for S. uberis in 9.4%. A total of five virulence genes were detected. GapC+sua (56.2%) constituted the most common gene pattern. The highest virulence gene gapC was detected in 78.1% (25/32) of the isolates. The cylE gene was not detected (0%) in the isolates. Streptococcus species may play a role in mastitis in sheep, emphasising the need for meticulous hygienic milking practices.

Changes in soil properties due to land reclamation and climate change in South Moravian floodplain forestOriginal Paper

Luboš Sedlák, Soham Basu, Lubica Pospíšilová, Alois Prax, Jiří Kulhavý, Jakub Prudil, Hana Hornová, Tomáš Vichta

Soil & Water Res., 2023, 18(4):227-235 | DOI: 10.17221/34/2023-SWR

Land use changes together with riverbed regulations to avoid the annual floods affect the ecosystem of floodplain forests. Later subsequent revitalization measures, transboundary controlled river management, wetland restoration, and integrated planning were realized to reduce the negative effect of groundwater dropping and other environmental problems. This study aimed to follow the dynamic of groundwater level, soil properties and forest vitality as affected by climate change. The continuous dataset (2019–2022) of soil physical and hydrophysical parameters and tree radial growth parameters were obtained. Groundwater level was evaluated by z-score and the means, and standard deviation values were considered. The monthly assessment of soil and climatic conditions showed that the uneven distribution of rainfall and the increase in temperatures have significantly affected the soil hydrological regime and forest growth. Continual monitoring is necessary to prepare projection models, which can help better understand both the soil and tree growth parameters in the changing environment.

Integrated effect of residue management and drip irrigation on crop growth and water productivity of direct seeded riceOriginal Paper

Kanwar Barjinder Singh, Gurpreet Singh, Rajeev Kumar Gupta, Ahmed A. Al-Othman, Abed Alataway, Ahmed Z. Dewidar, Mohamed M. Mattar

Plant Soil Environ., 2023, 69(11):554-565 | DOI: 10.17221/105/2023-PSE

Crop residue management and water saving are the two major issues for the sustainability of the rice-wheat cropping system. Therefore, a two-year field experiment was conducted in a split-plot design to study the combined effect of three rice residues (residue incorporation (RI), residue standing (RS) and residue removal (RR) and two wheat residue incorporation (WI) and residue removal (WR) management in main plots and two irrigation regimes, i.e., flood (F) and surface drip (SD) in subplots on the growth and water productivity of direct seeded rice (DSR). During both years, RI-WI resulted in significantly higher plant height (PH), leaf area index (LAI) and dry matter accumulation (DMA) than in other residue management treatments. Drip irrigation significantly increased PH, LAI, DMA grain yield, straw, and biological yield, along with a 9.6% irrigation water savings over flood irrigation. During both years, grain yield, straw and biological yield of DSR were significantly higher in RI-WI than in RR-WR and RR-WI. RI-WI had significantly greater apparent water productivity (AWP) and actual water productivity (RWP) of DSR. Drip irrigation had significantly higher AWP and RWP during both years than flood irrigation except RWP during 2017. Transpiration efficiency (TE) in rice residue incorporation was significantly higher than in rice residue standing and removal. During both years, the TE of drip irrigation was also significantly higher than flood irrigation. So, incorporating rice and wheat residues along with drip irrigation improves crop growth and water productivity.

Impact of an organic fertiliser on the yield of white cabbage (Brassica oleracea var. capitata) and the soil productivityOriginal Paper

Danguolė Kavaliauskaitė, Rasa Karklelienė, Julė Jankauskienė

Hort. Sci. (Prague), 2023, 50(4):290-296 | DOI: 10.17221/33/2022-HORTSCI

The aim of this study was to determine the effect of a granular poultry manure fertiliser on the yield and the quality of white cabbage (Brassica oleracea var. capitata), and to determine the effect on the soil agrochemical properties. The effect of the granular poultry manure fertiliser and mineral fertiliser (applied separately and combined at different times – in early spring and in autumn) on the cabbage yields was determined. Investigations were carried out in the fields of the Institute of Horticulture, the Lithuanian Research Centre for Agriculture and Forestry. The object of the research – white cabbage ‘Socrates’ H. The highest white cabbage marketable yield (80.5 t/ha) and the highest amount of vitamin C (7.80 mg per 100 g of products) was obtained by applying the granular poultry manure fertiliser in the autumn and the mineral fertiliser in the spring, where the granular poultry manure fertiliser applied in the early spring and the granular poultry manure fertiliser applied in the autumn with the mineral fertiliser applied in spring retained a higher content of humus (1.82–1.94%), organic carbon (1.06–1.12%) and total nitrogen (0.099–0.147%). The mineral nitrogen residue in the soil decreased when the cabbage was fertilised in the spring with the mineral fertiliser and when fertilised in the spring with the mineral fertiliser in combination with the granular poultry manure fertiliser by 8.1–10.8 kg/ha. The minimum content of nitrates in the heads of the white cabbage was found after using the granular poultry manure fertiliser in the autumn.

Efficiency of selenium biofortification of spring wheat: the role of soil properties and organic matter amendmentOriginal Paper

Tomáš Mrština, Lukáš Praus, Lukáš Kaplan, Jiřina Száková, Pavel Tlustoš

Plant Soil Environ., 2022, 68(12):572-579 | DOI: 10.17221/357/2022-PSE

The effect of soil selenate application to two different soils (Phaeozem and Cambisol) on biomass yield and selenium (Se) uptake by spring wheat (Triticum aestivum L.) was investigated in a pot experiment. Additionally, organic amendment (fugate, i.e. liquid by-product from the biogas plant) was applied to assess (i) the effect of organic matter on the bioavailability of Se and (ii) the fugate (containing 2.3 mg/kg of Se) as a potential source of Se for plants. Selenium was applied at two levels: 6.4 µg/kg (Se1) and 32 µg/kg (Se2) of soil. The efficiency of biofortification and the distribution of selenium within individual plant compartments were assessed in this case. The highest Se contents in the grain were achieved in the treatments receiving NPK fertiliser together with selenate, 455 µg/kg (Se1) and 2 721 µg/kg (Se2) when wheat was planted in Phaeozem. Fugate in co-application with selenate significantly reduced Se content in wheat plants as compared to treatments enriched solely with selenate. The lower Se contents in the wheat plants growing in Phaeozem were due to the biodilution effect, whereas in Cambisol, the decrease in wheat Se uptake was not clearly driven by a particular factor.

Silvicultural options to promote natural regeneration of Scots pine (Pinus sylvestris L.) in Western Ukrainian forestsOriginal Paper

Vasyl Lavnyy, Peter Spathelf, Rostyslav Kravchuk, Ruslan Vytseha, Volodymyr Yakhnytskyy

J. For. Sci., 2022, 68(8):298-310 | DOI: 10.17221/73/2022-JFS

Scots pine (Pinus sylvestris L.) forests belong to the most relevant forest types in the Western Ukrainian Roztochia area. The promotion of close-to-nature forest management in Ukraine in the framework of the forest strategy 2 035 supports natural regeneration and the application of diverse felling methods beyond clearcutting. In the present study, natural regeneration was analysed in mixed Scots pine stands on poor and relatively rich soils, after small clearcuts, shelterwood cutting and gap fellings (with or without soil preparation), with respect to tree species composition, species abundance and height growth. It could be shown that Scots pine is the most abundant species in all the felling systems, with on average more than 100 000 plants per ha on poor soils. Other admixed tree species only occur with small shares. Natural regeneration, especially of Scots pine, was less abundant on rich soils and in shelterwood, compared to a small clearcut. After the young plants have established, their abundance declined in the second and third year due to competing herbaceous plants and thick litter.

δ13C as a tool to determine the origin of soil organic carbon: Case study of a restored sloping orchardOriginal Paper

Mateja Muršec, Jean Leveque

Soil & Water Res., 2023, 18(2):81-88 | DOI: 10.17221/101/2022-SWR

The effect of drip irrigation on the origin and size fraction of soil organic carbon was studied in the soils of an apple orchard (Malus domestica Borkh.) on hilly (20%) terrain in northeastern Slovenia in three slope positions (upslope, midslope and downslope), comparing irrigated with non-irrigated soils. Physical fractionation of soil organic carbon was performed on three soil layers (0–0.05, 0.05–0.15 and 0.15–0.30 m) in three size fractions: fraction A (> 0.0002 m), fraction B (0.0002‒0.00005 m) and fraction C (< 0.00005 m). Fraction A was the richest in soil organic carbon (7.7%), but fraction C was the dominant fraction in the total soil volume (86‒92%), making it the largest source of soil organic carbon (73%). The δ13C signature was performed to determine the existence of two different types (origins) of soil organic carbon: fresh and sedimentary. Fresh organic carbon dominates in the A fraction, while sedimentary organic carbon dominates in the C fraction and may contribute to higher structural stability, besides higher carbonates in the finest fraction. Irrigation mainly contributes to the higher stock of soil organic carbon (predominantly fresh and less sedimentary) in the coarse A fraction (21.14 t/ha in irrigated and 14.17 t/ha in non-irrigated soils).

Adaptation analysis of insect-resistant transgenic line after introducing mcry1F gene in maizeOriginal Paper

Daming Wang, Junqi Yin, Fengci Wu, Baifeng Wang, Zhilei Jiang, Jingang Liang, Xinyuan Song

Plant Soil Environ., 2023, 69(1):18-24 | DOI: 10.17221/286/2022-PSE

The ability to adapt, survive, and compete with weeds of transgenic plants is the necessary evaluation content to release transgenic lines in target regions. We compared weediness and agronomic traits of transgenic maize lines G1F-8 and G1F-19 carrying the mcry1F gene with their near-isogenic maize inbred line Zheng 58 in the wasteland and cultivated field under natural conditions for two consecutive years. The results showed that there was no significant difference identified in the species, quantity, and relative coverage ratio (RCR) of weeds between fields with G1F-8, G1F-19, and Zheng 58, regardless of the sowing pattern in the wasteland. Compared with the vigour of weeds, none of G1F-8, G1F-19, and Zheng 58 showed survival advantages, and all showed weak growth potential with no final grain yield. Meanwhile, no volunteer seedlings were found upon investigation in the following year. The simulated seed overwintering experiment in the wasteland further showed that the three kinds of maize could not germinate in the second year. In cultivated land, G1F-8 and G1F-19 had the same growth stages, plant height, and RCR as Zheng 58 throughout two years. In conclusion, the transgenic lines G1F-8 and G1F-19 exhibited no adaptability risk in Gongzhuling, Jilin, China.

Prediction of the soil organic carbon in the LUCAS soil database based on spectral clusteringOriginal Paper

Baoyang Liu, Baofeng Guo, Renxiong Zhuo, Fan Dai, Haoyu Chi

Soil & Water Res., 2023, 18(1):43-54 | DOI: 10.17221/97/2022-SWR

The estimation of the level of the soil organic carbon (SOC) content plays an important role in assessing the soil health state. Visible and Near Infrared Diffuse Reflectance Spectroscopy (Vis-NIR DRS) is a fast and cheap tool for measuring the SOC. However, when this technology is applied on a larger area, the soil prediction accuracy decreases due to the heterogeneity of the samples. In this paper, we first investigate the global model performance in the LUCAS EU-wide topsoil database. Then, different clustering strategies were tested, including the k-means clustering based on the principal component analysis (PCA) and hierarchical clustering, combined with the partial least squares regression (PLSR) models, and a clustering based on a local PLSR approach. The best validation results were obtained for the local PLSR approach with R2 = 0.75, root mean squared error of prediction (RMSEP) = 13.38 g/kg and ratio of performance to interquartile range (RPIQ) = 2.846, but the algorithm running time was 30.05 s. Similar results were obtained for the k-means clustering method with R2 = 0.75, RMSEP = 14.61 g/kg and RPIQ = 2.844, at only 4.52 s. This study demonstrates that the PLSR approach based on k-means clustering is able to achieve similar prediction accuracy as the local PLSR approach, while significantly improving the algorithm speed. This provides the theoretical basis for adapting the spectral soil model to the needs of real-time SOC quantification.

Coumarin derivatives as antifungal agents – A reviewReview

Mirjana Lončar, Dajana Gašo-Sokač, Maja Molnar*

Czech J. Food Sci., 2023, 41(2):79-91 | DOI: 10.17221/178/2021-CJFS

Coumarins and pyridines are a promising class of naturally occurring bioactive heterocycles with unique physical and chemical properties. Compounds containing the coumarin framework possess a wide range of pharmacological, biological, and physiological activities, which makes them important for application in medicine, the food industry and agriculture. Among all coumarins' properties, it was found that coumarins may prevent fungal growth, depending on substituents linked to the coumarin core. Therefore, many coumarin derivatives have been investigated as potentially powerful agents in preventing and controlling fungal pathogens. This review summarises the latest research on coumarins and their antifungal activity to provide useful information for further developing more efficient coumarin-based fungicides.

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