Three Alternative Nitrogen Management Strategies for Cereal Grain Production

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Three Alternative Nitrogen Management Strategies
for Cereal Grain Production

• Brian Arnall
• Plant and Soil Sciences Department
• Oklahoma State University

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Introduction

• Scrutiny of Nitrogen Application
• Environmental impact
• Rise in Fuel and Nitrogen cost
• Temporal Variability
• What Nature Provides
• Unpredictable Variables

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Response Index
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N-Rich Strip

• The Nitrogen Rich Strip
• What is it?
• When and Where can it be used?
• Ease of application
• Drive by visibility

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N-Rich Strip

• Yes or No

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N-Rich Strip

• Sensor Based Nitrogen Rate Calculator
• Using Sensor Data and the Nitrogen Fertilizer
• Optimization Algorithm, N-Rates are prescribed
  for that field and its condition.

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Nitrogen Fertilizer Optimization Algorithm
Aug 16, 2002
Aug 28, 2002
1. Establish preplant N Rich Strip(NRS) 4.
Determine Response Index (RI)2. NDVI (biomass)

NDVINRS/NDVIFarmer3. Predict potential yield
5. Predict potential
grain yield need of days from planting to
(YP0) with added N, YPN (YP0RI)
sensing (INSEY biomass prod./day) 6.
Fertilizer Rec (grain N uptake INSEY vs.
Yld eqn. YPN
grain N uptake YP0/0.7)
CORN
YPN
RI
May
June
August
NDVI (sensing date)
YP0
Planting date
days from planting to sensing (GDDgt0)
WHEAT
November
March
June
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Ramp Calibration Strip

• The Ramp Calibration Strip
• 16 N rates
• 0 195 lb N ac-1 (can be adjusted for other
  crops)
• Rate Interval 10 ft (adjustable)
• Truck or ATV mounted

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Ramp Calibration Strip

• Walk it off

0 N
195 N
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Ramp Calibration Strip

• Sensor Based

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Strip Alternatives
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VRT

• Variable Rate N Application
• Resolution
• Wheat .4 m2
• Corn By-Plant

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VRT Equipment
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VRT Equipment
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Questions?
For More Informationwww.nue.okstate.edu