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Crop Sensors to Control Variable-Rate N Applications: Five Years of On-Farm Demonstrations

Controller runs ball valve to change fertilizer rate. Computer in cab reads sensors, calculates N rate, directs controller. sensors. Crop Sensors to Control Variable-Rate N Applications: Five Years of On-Farm Demonstrations.

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Crop Sensors to Control Variable-Rate N Applications: Five Years of On-Farm Demonstrations

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  1. Controller runs ball valve to change fertilizer rate Computer in cab reads sensors, calculates N rate, directs controller sensors Crop Sensors to Control Variable-Rate N Applications: Five Years of On-Farm Demonstrations Peter Scharf, Kent Shannon, Harlan Palm, Ken Sudduth, Newell Kitchen and Scott Drummond, Univ. of Missouri and USDA-ARS Introduction • Optimal N rate often varies widely within & among fields • Weather has a large influence on optimal N rate • Static properties can’t predict • Color & reflectance of crop is strongly related to N status & need Methods *Effect is calculated relative to an in-season N application whose rate was chosen by the producer • Identify producers/retailers with: • Interest • Sidedress/topdress equipment • Controller with serial input • Develop algorithm to convert sensor values to N rates • Develop control software • Make sensor brackets • Apply high-N reference area • Apply in-season N • Producer rate and sensor variable-rate side by side • Minimum 3 replications Lessons learned Turning a sensor reading into an N rate • A good high-N reference area/value is critical • Sensor values drift—need a solution • Timing is the biggest issue to producers Cropscan, Crop Circle V6-V7 (line basd on data points shown) Crop Circle V8-V10 Greenseeker V6-V7 Greenseeker V8-V10

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