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.
Тематический раздел:
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.
Ключевые слова
corn environment meta-response function nitrogen restriction precision farming site-specific management (SSM) spatial variability weather variability
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