Template-Type: ReDIF-Article 1.0 Author-Name: P. Kovaříček Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague-Ruzyně, Czech Republic Author-Name: R. Šindelář Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague-Ruzyně, Czech Republic Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: J. Hůla Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague-Ruzyně, Czech Republic Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: I. Honzík Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Title: Measurement of water infiltration in soil using the rain simulation method Abstract: : For the measurement of the infiltration speed under operational conditions, we were equipped by a rain simulator with the measuring surface of 0.5 m2. The infiltration speed is determined from the defined rain intensity and water surface runoff from the measured surface. The retained water mass from the surface runoff is recorded at regular time intervals over the whole measuring period. The beginning of the water runoff from the measured surface indicates the beginning of elutriation. The measuring time is finished after the infiltration speed has been stabilised. The beginning of elutriation and infiltration speed stabilisation are typical and mutually comparable parameters for defined soil properties at the site followed. Keywords: rain simulator, rainfall intensity, water surface runoff, water infiltration speed in soil Journal: Research in Agricultural Engineering Pages: 123-129 Volume: 54 Issue: 3 Year: 2008 DOI: 10.17221/711-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/711-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200803-0001.txt Handle: RePEc:caa:jnlrae:v:54:y:2008:i:3:id:711-RAE Template-Type: ReDIF-Article 1.0 Author-Name: M. Mimra Author-Workplace-Name: Department of Machinery Utilisation and Author-Name: M. Kroulík Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: V. Altmann Author-Workplace-Name: Department of Machinery Utilisation and Author-Name: M. Kavka Author-Workplace-Name: Department of Machinery Utilisation and Author-Name: V. Prošek Author-Workplace-Name: Department of Machinery Utilisation and Title: The analysis of the relationship between the electrical conductivity values and the valued soil-ecological units values Abstract: This article describes the results of the analysis of correlation between the soil electrical conductivity and BPEJ (valued soil-ecological units). The measurements were made in 2006 at the School Agribusiness Land Farm in Lány established by the Czech University of Life Sciences in Prague. The soil electrical conductivity (EC) was measured by the contact method using a sensor with six electrodes. The soil EC data measured were compared with the data obtained from BPEJ maps. The aim was to verify if any relationship exists between the soil EC and BPEJ. The results achieved show that the same dependency exists between the values of the main soil unit of the BPEJ code and the soil EC. The results achieved can be used in the precise agriculture system to improve the decision process. Keywords: soil EC, soil classification, soil variabilty Journal: Research in Agricultural Engineering Pages: 130-135 Volume: 54 Issue: 3 Year: 2008 DOI: 10.17221/712-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/712-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200803-0002.txt Handle: RePEc:caa:jnlrae:v:54:y:2008:i:3:id:712-RAE Template-Type: ReDIF-Article 1.0 Author-Name: L. Ryšan Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: O. Šařec Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Title: Research of correlation between electric soil conductivity and yield based on the use of GPS technology Abstract: A contact method was used for the continuous measuring of soil electric conductivity using a six disc electrodes apparatus. The placement of the electrodes was chosen on the basis of the depth of the profiles surveyed: 0-0.3 and 0-0.9 m. Two Crop Research Institute fields and two private Farma Dolejšová fields were followed in 2004 and 2005. For the treatment of the EC data obtained and of other information, the tools of geostatistic were applied. Arc View GIS software and its module Geostatistical analyst were used for the analysis of the geo-data obtained and for the elaboration of the soil conductivity and crop yield maps. Four variogram models were tested. Geostatistical analyses make relatively rigorous demands on wide-sense stationarity or at least average stationarity. The selection of any one of the four geostatistical variogram models did not affect the final maps. Exponential model is recommended. The experiments documented a correlation between the two EC profiles investigated but no correlation was found between EC and the yield of crop. Every field and every property has its own characteristic surface which does not correspond with other ones. Keywords: soil electric conductivity, precision farming, soil properties, geostatistic Journal: Research in Agricultural Engineering Pages: 136-147 Volume: 54 Issue: 3 Year: 2008 DOI: 10.17221/714-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/714-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200803-0003.txt Handle: RePEc:caa:jnlrae:v:54:y:2008:i:3:id:714-RAE Template-Type: ReDIF-Article 1.0 Author-Name: P. Findura Author-Workplace-Name: Department of Machines and Production Systems, Slovak Agricultural University in Nitra, Nitra, Slovakia Author-Name: L. Nozdrovický Author-Workplace-Name: Department of Machines and Production Systems, Slovak Agricultural University in Nitra, Nitra, Slovakia Author-Name: P. Tóth Author-Workplace-Name: Department of Machines and Production Systems, Slovak Agricultural University in Nitra, Nitra, Slovakia Author-Name: Ľ. Mrázová Author-Workplace-Name: Department of Machines and Production Systems, Slovak Agricultural University in Nitra, Nitra, Slovakia Title: Evaluation of the work quality of the sugar beet planter in relation to the sugar beet seed parameters Abstract: : Due to the restructuring of the Slovak agriculture managed by the Common agricultural policy of the European union, the acreage under sugar beet has been significantly reduced (32 000 ha in 2003, 27 700 ha in 2006). For the growers with a high intensity of growing, sugar beet has the potential to bring profit. The quality of the crop stand establishment during seeding is considered as the basis for a high yield of the sugar beet roots. Biological and technological properties of sugar beet seed, tillage quality and the quality of the seed placement into the soil have a dominant effect on the value and evenness of the sugar beet field emergence. A regular seed placement is also required as the precondition for minimising the harvest losses. During seeding, the distance between two successive seeds in the row depends upon the technical parameters of the planter - forward speed, type of the seeding unit mounting to the frame, the design and the type of the seeding mechanism drive. Our paper is focused on the comparison of the seeding quality of two types of sugar beet planters equipped with different seeding mechanisms: ground driven seeding mechanism and electric motor driven seeding mechanism. Unicorn synchro drive planter provided better results (x2 = 17.89 mm) than Meca 2000 planter (x2 = 28.44 mm). The planters were evaluated in experiments conducted in field conditions according to the International standard ISO 7256/1. Keywords: sugar beet, seeding quality, exact seeding Journal: Research in Agricultural Engineering Pages: 148-154 Volume: 54 Issue: 3 Year: 2008 DOI: 10.17221/713-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/713-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200803-0004.txt Handle: RePEc:caa:jnlrae:v:54:y:2008:i:3:id:713-RAE Template-Type: ReDIF-Article 1.0 Author-Name: P. Hůla Author-Workplace-Name: ABB s.r.o., Robotics Division, Prague, Czech Republic Author-Name: R. Šindelář Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: A. Trinkl Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Title: Verification of applicability of ABB robots for trans-planting seedlings in greenhouses Abstract: The article deals with the verification of applicability of different types of ABB industrial robots for trans-planting seedlings. Initial hypothesis was formulated at the beginning namely that the robots with full rotary series and parallel kinematical structure can be employed in the operation of trans-planting seedlings. Testing was performed on real types of robots IRB 1400, IRB 140T and IRB 140B, and using model application. The robot IRB 340 was tested in virtual simulation only. Based on the measurements, it was found out that all real robots tested are able to perform the operation of seedlings trans-planting involving 36 plants with the cycle duration below 2.7 min and at 100% success rate. Within the given range of the movement velocity no statistically significant differences in the cycle duration or in the number of wrongly trans-planted seedlings were found between different robot types. It can be therefore concluded that all the robots tested can be used for trans-planting seedlings. Keywords: robotisation in agriculture, kinematical structures, robots and manipulators, trans-planting seedlings Journal: Research in Agricultural Engineering Pages: 155-162 Volume: 54 Issue: 3 Year: 2008 DOI: 10.17221/715-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/715-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200803-0005.txt Handle: RePEc:caa:jnlrae:v:54:y:2008:i:3:id:715-RAE