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Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn

Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn. Yield-based approach to N recommendations has been questioned Poor relationship between recommendations and EONR from N rate response trials Uncertainly about how yield goals should be determined

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Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn

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  1. Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn

  2. Yield-based approach to N recommendations has been questioned • Poor relationship between recommendations and EONR from N rate response trials • Uncertainly about how yield goals should be determined • Assumption that NUE is constant across sites anyears • Use of inadequate or inappropriate adjustments for nonfertilizer N sources

  3. Data showed that optimum N rates increased over time at one site and decreased at the other site • Results provide no clear indication of a change in N rates over time • Reasons for similar or decreasing optimum N rates where yields have increased substantially include more efficient utilization of available N by the crop and increased soil N supplying capability

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