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Concepts and Rationale for Regional Nitrogen Rate Concepts and Rationale for Regional Nitrogen Rate

Concepts and Rationale for Regional Nitrogen Rate - PowerPoint Presentation

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Uploaded On 2019-06-24

Concepts and Rationale for Regional Nitrogen Rate - PPT Presentation

Guidelines for Corn Yieldbased 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 ID: 760176

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Presentation Transcript

Slide1

Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn

Slide2

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

Slide3

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