Title: Three Alternative Nitrogen Management Strategies for Cereal Grain Production
1Three Alternative Nitrogen Management Strategies
for Cereal Grain Production
- Brian Arnall
- Plant and Soil Sciences Department
- Oklahoma State University
2Introduction
- Scrutiny of Nitrogen Application
- Environmental impact
- Rise in Fuel and Nitrogen cost
- Temporal Variability
- What Nature Provides
- Unpredictable Variables
3Response Index
4N-Rich Strip
- The Nitrogen Rich Strip
- What is it?
- When and Where can it be used?
- Ease of application
- Drive by visibility
5N-Rich Strip
6N-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.
7Nitrogen 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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9Ramp 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
10Ramp Calibration Strip
0 N
195 N
11Ramp Calibration Strip
12Strip Alternatives
13VRT
- Variable Rate N Application
- Resolution
- Wheat .4 m2
- Corn By-Plant
14VRT Equipment
15VRT Equipment
16Questions?
For More Informationwww.nue.okstate.edu