Template-Type: ReDIF-Article 1.0 Author-Name: J. Blahovec Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Density and shape characteristics of Agria tubers cultivated at different conditions Abstract: Potato variety Agria was cultivated in different fertilising and/or irrigation regimes. Individual tuber dimension and the individual tuber density were studied two months after the harvest with aim to find some potential relation between tuber density and its shape. The stem-bud density gradient was also studied by determination the density of the stem, middle and bud parts of the individual tubers. The results of the measurements brought information on relatively variable parameters that slightly depended on the cultivation conditions. Keywords: potato, density, stem, bud, cultivation regime, shape factor, elongation, flatness Journal: Research in Agricultural Engineering Pages: 1-6 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4894-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4894-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0001.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4894-RAE Template-Type: ReDIF-Article 1.0 Author-Name: Z. Strašil Author-Workplace-Name: Research Institute of Crop Production, Prague-Ruzyně, Czech Republic Author-Name: V. Váňa Author-Workplace-Name: Research Institute of Crop Production, Prague-Ruzyně, Czech Republic Author-Name: M. Káš Author-Workplace-Name: Research Institute of Crop Production, Prague-Ruzyně, Czech Republic Title: The reed canary grass (Phalaris arundinacea L.) cultivated for energy utilization Abstract: The reed canary grass as a source of energy was tested in field experiments on small plots at three different sites in 1996-2003. The effects of soil and weather conditions, different times of harvest (July, November, March) and different doses of nitrogen fertilization (0, 30, 60 kg/ha) on yields of phytomass were investigated. The effects of the harvest time on the water content in harvested phytomass, loss of phytomass in different harvest period and the content of basic nutrients and heavy metals in plants were all specified. The influence of the year, site and N fertilization on yields of phytomass of the reed canary grass was highly significant. The reed canary grass responded positively to increasing doses of nitrogen by the increase of yields of phytomass. On the averages of years and sites, the N application dose of 30 kg/ha increased dry phytomass yields of the reed canary grass harvested in November by 14.6% (1.08 t/ha). The higher dosage of N 60 kg/ha increased yields of phytomass of the reed canary grass at all sites by 32.8% (2.08 t/ha) on average in contrast with variants without fertilization. By the dose of N 60 kg/ha, the dry above-ground phytomass harvested in autumn was 10.04 t/ha in Ruzyně, 8.27 t/ha in Lukavec and 6.94 t/hain Chomutov on average over the whole period. The later times of harvest resulted in a decrease of the average yield of phytomass (8.41 t/ha in July, 8.00 t/ha in November and 6.04 t/ha in March) and the average water content (64.3% - 45.2% - 21.5%); on the contrary, energy value of phytomass increased (16.93 GJ/t - 17.02 GJ/t - 17.19 GJ/t). The average content of ash in plants varied from 6.5% in Lukavec to 9.31% in Chomutov. The content of heavy metals in plants never exceeded the highest permissible values set in the Czech Republic for food and feed purposes. Keywords: reed canary grass, yields of phytomass, energy yield, N fertilization, times of harvest, content of nutrients, content of heavy metals Journal: Research in Agricultural Engineering Pages: 7-12 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4895-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4895-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0002.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4895-RAE Template-Type: ReDIF-Article 1.0 Author-Name: C. Çirak Author-Workplace-Name: Faculty of Agriculture, Department of Agronomy, University of Ondokuz Mayis, Kurupelit, Samsun, Turkey Author-Name: M. S. Odabaş Author-Workplace-Name: Faculty of Agriculture, Department of Agronomy, University of Ondokuz Mayis, Kurupelit, Samsun, Turkey Author-Name: B. Sağlam Author-Workplace-Name: Faculty of Agriculture, Department of Agronomy, University of Ondokuz Mayis, Kurupelit, Samsun, Turkey Author-Name: A. K. Ayan Author-Workplace-Name: The High School of Profession of Bafra, University of Ondokuz Mayis, Samsun, Turkey Title: Relation between leaf area and dimensions of selected medicinal plants Abstract: In this research, leaf area prediction models were developed for some leaf-used medicinal plants namely Calamintha nepeta, Datura stromonium, Melissa officinalis, Mentha piperita, Nerium oleander, Origanum onites and Urtica dioica growing wild in Black Sea region of Turkey. Lamina width, length and leaf area were measured non-destructively to develop the models. The actual leaf areas of the plants were measured by PLACOM Digital Planimeter, and multiple regression analysis with Excel 7.0 computer package program was performed for the plants separately. The produced leaf area prediction models in the present study were formulized as LA = (a) + (b1 × L) + [(b2 × (L × W)] + (b3 × L2) + (b4 × W2) + [b5 × (L × W2)] + [b6 × (L2 × W)] + [b7 × (L2 × W2)] where LA is leaf area, W is leaf width, L is leaf length and a, b1, b2, b3, b4, b5, b6, and b7 are coefficients. R2 values for medicinal plants tested varied with species from 0.82 in Origanum onites to 0.98 in Urtica dioica. All R2 values and standard errors were found to be significant at the P < 0.001 level. Keywords: modelling, leaf area, medicinal plants Journal: Research in Agricultural Engineering Pages: 13-19 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4896-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4896-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0003.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4896-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Tajboš Author-Workplace-Name: Faculty of Forestry, Technical University in Zvolen, Zvolen, Slovak Republic Author-Name: T. Lukáč Author-Workplace-Name: Faculty of Forestry, Technical University in Zvolen, Zvolen, Slovak Republic Title: New technique and technology of industrial splitting of stacked wood - log-splitter WS 800 Abstract: Wood splitting, manual as well as mechanized one is a heavy work. It follows from the fact that usually the wood of the least quality, knot wood with scroll fibres, directed for less valuable assortments from the point of view of the price. Present technique on the contrary is relatively price demanding, requesting besides 2-4 members of operating personnel also adequate concentration of wood mass for the reason of the complete process economic efficiency. We submit in this paper technology analysis of the splitter WS 800 performance with the original concept for the wood manipulation and splitting process as well. Essential advantages of the mentioned splitter comparing with the stationary equipments are operational and interoperational wood manipulation, physical effort and operating personnel elimination, while the efficiency and work safety is increasing. Keywords: wood splitter, wedge, splitting knife, technology, efficiency Journal: Research in Agricultural Engineering Pages: 20-27 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4897-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4897-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0004.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4897-RAE Template-Type: ReDIF-Article 1.0 Author-Name: P. Hutla Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague, Czech Republic Author-Name: P. Jevič Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague, Czech Republic Author-Name: J. Mazancová Author-Workplace-Name: Institute of Tropics and Subtropics, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: D. Plíštil Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Emission from energy herbs combustion Abstract: The energy herb and waste agricultural biomass create important potential of fossil fuels replacement for heating. At present is being used straw, other energy crops are energy sorrel, reed canary grass, knotweed and miscanthus. At biomass combustion are monitored CO and NOx emissions. For five types of fuels were measured the emission parameters during their combustion in boiler for straw of output 1 MW. The CO emissions are very different for individual fuels. The highest values were achieved for energy sorrel combustion. Keywords: energy crops, emissions, combustion, heating, boiler room, biomass, energy sorrel Journal: Research in Agricultural Engineering Pages: 28-32 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4898-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4898-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0005.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4898-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Páltik Author-Workplace-Name: Slovak Agricultural University in Nitra, Nitra, Slovak Republic Author-Name: L. Nozdrovický Author-Workplace-Name: Slovak Agricultural University in Nitra, Nitra, Slovak Republic Author-Name: P. Findura Author-Workplace-Name: Slovak Agricultural University in Nitra, Nitra, Slovak Republic Author-Name: J. Maga Author-Workplace-Name: Slovak Agricultural University in Nitra, Nitra, Slovak Republic Title: Quality of the seed placing in seeding of sugar beet Abstract: Evaluation of the quality of the sugar beet seeding in field condition is considered. Field experiments were conducted with the set of single seed drills (precision drills) in accordance with the international standard ISO 7256/1. The variability of plant spacing in the row and seeding depth were evaluated. The attention has been payed also to the soil condition and to properties of seeding material, which has been used. For the measuring of seeding depth the inductive and ultrasound sensor were used. According to the results obtained significant differences were observed among the precision drills, which were involved in field experiments. The variability of emerged plants was evaluated by standard deviation (δ) and best results were reached with precision drill Monopill S (δ = 17.8 mm) and the worst results precision drill Magicsem 4000 (δ = 44.0 mm). In general, precision drills with internal filling of gathering openings (Monopill S, Meca 2000 and others) allowed to obtain higher work quality when machine was moved at optimal forward speed and not at minimal forward speed. As far as seeding depth variability concerns, all tested precision drills caused the decreasing of the seeding depth by 10-15%, when increased forward speed was used. For all tested precision drills the lowest seeding depth variability was observed at the forward speed of 1.65-1.73 m/s (standard deviation δ = 5.08-7.69 mm). Keywords: sugar beet, seeding, precision drills, plant spacing, seeding depth Journal: Research in Agricultural Engineering Pages: 33-38 Volume: 51 Issue: 1 Year: 2005 DOI: 10.17221/4899-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4899-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200501-0006.txt Handle: RePEc:caa:jnlrae:v:51:y:2005:i:1:id:4899-RAE