Site-specific crop management with a center pivot
1998
Camp, C.R. | Sadler, E.J.
Traditionally, site-specific farming suggests the management of fertilizers and pesticides but research in the southeastern Coastal Plain of the United States suggests that spatial yield variability may be caused primarily by water relations. Site-specific management of water and chemical applications is difficult with conventional centre pivot irrigation systems. Site-specific irrigation systems were developed to apply independently variable rates of water, nutrients and pesticides to 100-m² areas. Two commercial centre pivot systems were modified by adding manifolds and nozzles along the truss to provide 8 application depths within each of thirteen 10-m segments. A programmable, computer-controlled management system uses stored Geographical Information System (GIS) data to provide the appropriate application rate for each area but can also be updated via real-time soil and crop measurements.
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