For the Karcher family farm, variable-rate application of inputs means keeping up with almost constant change in software, hardware, GPS and equipment. But the need for basic agronomy knowledge is always the same. The Karchers, cousins Brandon and Rob Karcher, and Brandon’s father, Ed, farm around 3,000 acres of corn, cotton, soybeans and wheat near Somerville, Tenn. They started experimenting with variable-rate applications of inputs in 1997, with the help of Tim Sharp, a precision ag ...

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