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The Missouri Algorithm aims to enhance nitrogen (N) application efficiency, preventing unnecessary waste and supporting optimal crop yields. It addresses key objectives, such as ensuring sufficient nitrogen supply, minimizing environmental risks, and utilizing spatial variability in nitrogen needs. Through field experiments and technology integration, including sensor demos for real-time N application adjustments, farmers can increase profitability while protecting water quality and reducing excess nitrogen runoff. The algorithm supports producers and consultants in achieving precise sidedress operations for various crops.
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Missouri algorithm:Design & objectives Peter Scharf University of Missouri Peter Scharf Newell Kitchen, Ken Sudduth, Glenn Davis, John Lory, Vicky Hubbard, Kent Shannon, Harlan Palm
On the way here, I saw a lot of money laying on the ground!!
Missouri Algorithm: Objectives • Don’t leave money laying on the ground • Supply enough N to the crop to support full yield • Don’t apply N that the crop doesn’t need • Don’t let N escape from fields to water
Crop N need is variable • Twenty on-farm N rate experiments in Missouri, corn after soybean, no manure • Most profitable N rates were 109, 114, 175, 0, 90, 190, 244, 63, 119, 300, 0, 146, 146, 180, 52, 175, 112, 149, 136, 114 lb N/acre
N underapplied N overapplied Wasted $ Environmental risk Overapplication = leftover N in soil
Mouth of Mississippi River Huge algal bloom
Missouri algorithm design:Just an empirical relationship • John Lory and I: initial calibration with Cropscan • Newell Kitchen et al: more recent field-scale calibration of Greenseeker and Crop Circle • Multi-state (country) data from this group
Missouri Algorithm: Objectives, Set 2 • Deal with spatial variability in N need • Support producer, retailers, consultants in planned sidedress operations from V6 to V16 • Support producer, retailers, consultants in rescue N applications when previously applied N has been lost
Supporting producers in planned sidedress operations using sensors • 26 demo fields in 2007 ( ) • 61 demo fields 2004-2007 Nearly 30 demo fields 2008, including first cotton field
Controller runs ball valve to change fertilizer rate Computer in cab reads sensors, calculates N rate, directs controller sensors Color sensors can be used for sidedressing anhydrous…
Overall: +$13/ac to sensors On-farm sensor demos 2004-2007
Sensor Benefits: • Make sure enough N is applied • Avoid unneeded N application
N application to head-high corn N rate map June 20, 2007
129 bu/ac 149 bu/ac High-N reference area 115 175 175
Sensor Benefits: • Make sure enough N is applied • Avoid unneeded N application
Avg Bu/A 208.6 Fixed 214.1 208.0 208.5 206.6 206.6 211.6 205.4 Variable 215.4 212.1 204.2 212.4 215.5 204.9 206.6 210.2
