Abstract
Agriculture is beginning to address the production and environmental problems of applying inputs to nonuniformfields by developing equipment which enables input rates to be varied. A prototype control system has beendeveloped to enable continuous move irrigation systems, such as center pivots, to spatially vary water and chemicalamounts. The control system was tested from 1992 to 1995 at the University of Idaho on a 100 m long three span linearmove irrigation system using catch cans to measure application patterns. Variable flow along the lateral was achieved ina stepwise manner using electric solenoid valves and control modules to operate multiple sprinklers with different nozzlesizes. All signals to the control modules were transmitted along a single cable by a microprocessor according to theposition of the irrigation system relative to a target application map. The precision of variable water and chemicalapplications to different areas within the same field was comparable to that of uniform applications over the entire field.
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