Login

Proceedings

Find matching any: Reset
Add filter to result:
Prediction of Nitrogen Needs with Nitrogen-rich Strips and Ramped Nitrogen Strips
1D. C. Roberts, 1B. W. Brorsen, 2W. R. Raun, 3J. B. Solie
1. Department of Agricultural Economics Oklahoma State University Stillwater, Oklahoma
2. Department of Plant and Soil Sciences Oklahoma State University Stillwater, Oklahoma
3. Department of Biosystems and Agricultural Engineering Oklahoma State University Stillwater, Oklahoma

Both nitrogen rich strips and ramped nitrogen strips have been used to estimate topdress nitrogen needs for winter wheat based on in-season optical reflectance data. The ramped strip system places a series of small plots in each field with increasing levels of nitrogen to determine the application rate at which predicted yield response to nitrogen reaches a plateau. The nitrogen-rich strip system uses a nitrogen fertilizer optimization algorithm based on optical reflectance measures from the nitrogen-rich strip and an untreated strip in the same field. This paper uses Wilcoxon Signed-Rank Tests to determine which of these two systems is expected to be more profitable. Our results indicate that the ramped strip method produces significantly greater profits than the nitrogen-rich strip system. This result is robust to varying assumptions used by the nitrogen- rich strip method. On average, the ramped strip system is more profitable by $55.69 ha-1. 

Keyword: Precision agriculture, nitrogen needs, yield potential