Abstract
ABSTRACT Simulation analysis was utilized in place of costly field experimentation to study the impact of nitrogen (N) fertilization on cotton productivity. Three strategies for applying N were examined using the cotton model GOSSYM with 22 years of historical weather from Lubbock, Texas. Sidedressing N at the rate of 89 g/mm of applied water beginning at first square (FS) or first bloom (FB) was compared to preplant (PP) application. Simulated PP yields were 4% higher than the sidedress strategies for a rainfed soil moisture regime, but with two supplemental irrigations totalling 204 mm, PP yields were 4% lower than the FS or FB strategies. Predicted micronaire values were unaffected by N application but declined as soil moisture level increased.
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