Determining Nitrogen Application Rates with SBNRC and RAMP Calculator

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Presentation transcript:

Determining Nitrogen Application Rates with SBNRC and RAMP Calculator

IKONIS Satellite Image of a Wheat Field Covington, Oklahoma Bottom Formerly in Alfalfa Eroded Hillside N-Rich 140 lb/ac Farm Rate 70 lb/ac 44 bu/ac farm Alfalfa Field Yield bu/ac IKONIS Satellite Image of a Wheat Field Covington, Oklahoma NRich Strip NDVI Map

Algorithm to Calculate N Rate with SBNRC 3 2001 YPN <= YPMAX 1 Predict RI Predict YP0 Predict YPN based on RI Fertilizer N = (GNUP-FNUP)/0.5 2 2 3 4 1 4

Ramp Concept Courtesy Larry Riechenberger

Idealized 16 Step Calibration Ramp NRich NDVI Field Rate NDVI Ramp Max or Upper Limit N Application Rate YP0 YPMax

Determining N Rate Using the RAMP Calculator 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 13.3 26.7 34.0 53.3 66.7 80.0 93.3 106.7 120.0 133.3 146.7 160.0 173.3 187.7 200.0 Ramp N Rates, lb/ac NDVI Determine Transition Curve Determine Plateau Optimum Fall Applied N Rate Calculating Topdress N Rate

Which Part of the Ramp Do We Measure? Do Not Sense Sense

MorrisonDemo Recommended Nitrogen Rate Average Rep 1 Rep 2 SBNRC 28 33 24 Ramp Analysis 32 16 17

T04 Recommended Nitrogen Rate Average Rep 1 Rep 2 SBNRC 44 2 87 Ramp Analysis 55 3 107* *Flag Too High Rate

T24 Recommended Nitrogen Rate Average Rep 1 Rep 2 SBNRC 63 62 64 Ramp Analysis 34 38 31

Recommendations Use the SBNRC with either the RAMP or NRich Strip to determine inputs to NTECH GreenSeeker sprayer The SBNRC and NRich strip works well provided you measure in the area of maximum response The SBNRC provides and estimate of yield with and without additional N fertilizer The SBNRC will calculate gross returns with and without additional N

Recommendations The SBNRC and the RAMP calculator will give the most precise estimate of potential of field NDVI and N non-limiting NDVI Use the SBNRC and the RAMP calculator if you want two independent estimates of the topdress N rate.