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Variable Rate Nitrogen Application on Corn Fields: The Role of Spatial Variability and Weather

Опубликовано на портале: 24-11-2003
Journal of Agricultural and Applied Economics. 2002.  Vol. 34. No. 1. P. 111-129. 
Meta-response functions for corn yields and nitrogen losses were estimated from EPIC-generated data for three soil types and three weather scenarios. These metamodels were used to evaluate variable rate (VRT) versus uniform rate (URT) nitrogen application technologies for alternative weather scenarios and policy options. Except under very dry conditions, returns per acre for VRT were higher than for URT and the economic advantage of VRT increased as realized rainfall decreased from expected average rainfall. Nitrogen losses to the environment from VRT were lower for all situations examined, except on fields with little spatial variability.

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