Independence of yield potential and crop nitrogen response |
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Authors: | William R Raun John B Solie Marvin L Stone |
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Institution: | (1) Department of Plant and Soil Sciences, Oklahoma State University, 044 N. Ag Hall, Stillwater, OK 74078, USA;(2) Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044 N. Ag Hall, Stillwater, OK 74078, USA |
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Abstract: | Crop yield level and nitrogen (N) responsiveness influence the demand for fertilizer. If they were found to be unrelated,
this would justify using a combination of both for determining fertilizer N requirements. Failure to understand the independence
of crop response to N and yield level has led to confusion as to what theory is appropriate for making N fertilizer rate recommendations.
The sufficiency approach applies a fixed rate of N at a computed sufficiency level, regardless of yield potential. Alternatively,
mid-season optical sensor estimates of yield potential and crop response to additional N provide a physiological basis to
estimate N removal and a biologically based N application rate. This study investigated the relationship between grain yield
and response to N in long-term wheat and corn experiments. No relationship between response to N and grain yield was found.
There was also no relationship between yield and year at two of three sites. Finally, there was no relationship between response
to N and year at any site. Because yield and response to N were consistently independent of one another, and as both affect
the demand for fertilizer N, estimates of both should be combined to calculate realistic in-season N rates. |
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