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This article in AJ

  1. Vol. 105 No. 5, p. 1335-1344
    OPEN ACCESS
     
    Received: Jan 23, 2013
    Published: July 8, 2013


    * Corresponding author(s): bill.raun@okstate.edu
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doi:10.2134/agronj2013.0034

Relationship between Grain Crop Yield Potential and Nitrogen Response

  1. D. B. Arnalla,
  2. A. P. Mallarinoe,
  3. M. D. Ruarkf,
  4. G. E. Varvelg,
  5. J. B. Solied,
  6. M. L. Stoned,
  7. J. L. Mullockb,
  8. R. K. Taylord and
  9. W. R. Raun *c
  1. a 373 Agricultural Hall, Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
    e Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
    f Dep. of Soil Science, Univ. of Wisconsin, Madison, WI 53706
    g Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583
    d Dep. of Biosystems and Agricultural Engineering; Oklahoma State Univ., Stillwater, OK 74078
    b 369 Agricultural Hall, Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
    c 044 N. Agricultural Hall, Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078

Abstract

The relationship between yield potential and N response in long-term cereal production is not well known. The objective of this study was to evaluate the relationship between yield potential (yield level) and N responsiveness in long-term winter wheat (Triticum aestivum L.) and maize (Zea mays L.) field experiments in Stillwater, OK (53 yr), Altus, OK (two trials, 45 yr each), Arlington, WI (49 yr), Shelton, NE (11 yr), Nashua, IA (32 yr), and Kanawha, IA (26 yr). Nitrogen responsiveness or the response index (RI) was determined by dividing the actual grain yield from high N rate plots by the yield from either the 0-N fertilizer check (RI 0-N) or medium N rate plots (RI mid-N). Linear relationships between maximum yield, RI 0-N, RI mid-N, and year were thus examined. For the seven long-term trials comprising 261 yr of site data, yield and N responsiveness were not related whether or not a medium N rate or the check plot (0-N) was used to determine RI. Because yield level and N responsiveness are independent, and both impact N demand, using both should assist in formulating more accurate fertilizer N recommendations.

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Copyright © 2013. Copyright © 2013 by the American Society of Agronomy, Inc.