SITE-SPECIFIC IRRIGATION: IMPROVEMENT OF APPLICATION MAPS AND DYNAMIC STEERING OF MODIFIED CENTRE PIVOT IRRIGATION SYSTEM
Current commercially available centre pivot (CP), linear-move and other sprinkler irrigation systems are normally capable and manage to apply relatively uniform controlled amounts of water, whereas the need for irrigation may differ between different zones of a particular field due to spatial soil variability. The 2nd span of CP including 15 nozzles was modified for site-specific irrigation using solenoid valves (SV), programmable logic control (PLC) and EIB-Bus communication protocol to evaluate the validation of site-specific irrigation control system and system modification and to examine water application uniformity. The PLC and the SV functioning were (open and close) were able to able to vary the amount of water proportionate to pulsing level and directly proportional to the fraction of time the valve was opened. There were no apparent problems with the pulsing water delivery system as in field tests were conducted. Except for 10％ pulsing level, measured irrigation depths were within 10％ of the target application rate. Error application of irrigation depth under low pulsing level of 10％ was found due to SV closing delay. Neither pulsing level of SV nor system movement speed had a significant effect and discernable impact on overall application uniformity.
Site-specific Variable rate Centre pivot Irrigation Application uniformity
Heinz Sourell Aboutaleb Hezarjaribi
Federal Research Institute for Rural Areas,Forestry and Fisheries,vTI,Institute of Agricultural Tech Gorgan University of Agricultural Sciences and Natural Resources,Gorgan,Golestan Province,Iran
国际会议
北京
英文
1-6
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）