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Independence of yield potential and crop nitrogen response

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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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Authors and Affiliations

  1. Department of Plant and Soil Sciences, Oklahoma State University, 044 N. Ag Hall, Stillwater, OK, 74078, USA

    William R. Raun

  2. Department of Biosystems and Agricultural Engineering, Oklahoma State University, 044 N. Ag Hall, Stillwater, OK, 74078, USA

    John B. Solie & Marvin L. Stone

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  1. William R. Raun
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  2. John B. Solie
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  3. Marvin L. Stone
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Correspondence to William R. Raun.

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Raun, W.R., Solie, J.B. & Stone, M.L. Independence of yield potential and crop nitrogen response. Precision Agric 12, 508–518 (2011). https://doi.org/10.1007/s11119-010-9196-z

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  • DOI: https://doi.org/10.1007/s11119-010-9196-z

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