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Increased efficiency of nitrogen (N) fertilizer use may be achieved with management practices that account for spatial variability in soil properties and temporal variability in climate. In this study, we develop a N management decision model for an irrigated wheat system that incorporates hypothetical diagnostics of soil N and growing season climate. The model is then used to quantify the potential...
Uncertainties in soil nitrogen (N) supply and crop N demand present a challenge to farmers deciding on N fertilizer rates. While field studies have documented the improvements in N use efficiency possible with site-specific N management approaches that address these uncertainties, a general understanding of the importance of uncertainty across a wide range of cropping systems is yet to emerge. Here...
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