Abstract
Adoption of variable‐rate N management by North American corn ( Zea mays L.) producers is low, despite the potential economic and environmental benefits of this practice. A major obstacle is that recommended N fertilizer rates based on yield goal are often poorly correlated with actual economically optimum N rates. Nitrogen response patterns are often field‐ and season‐specific and can vary widely within the same field, further complicating adoption. Side‐by‐side comparisons of uniform‐ and variable‐rate N management have revealed no consistent advantages for either strategy in yields achieved, profitability, whole‐field N usage, or N‐use efficiency by plants. In the future, a better understanding of temporal variation in N soil test levels, better crop simulation models, and improved N sensing and application equipment may assist growers in capturing the benefits of site‐specific N management.
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Claims 3
Claim · model-written summary
Yield goal recommended nitrogen rates are often poorly correlated with economically optimal rates.
Not reportedTaxonDirection
Verbatim
e0“recommended N fertilizer rates based on yield goal are often poorly correlated with actual economically optimum N rates”
Claim · model-written summary
Nitrogen response varies by field, season and within fields.
Not reportedTaxon
Verbatim
e0“Nitrogen response patterns are often field‐ and season‐specific and can vary widely within the same field”
Claim · model-written summary
Variable and uniform nitrogen rates show no consistent advantage in yield, profit, nitrogen use or nitrogen use efficiency.
Verbatim
e0“Side‐by‐side comparisons of uniform‐ and variable‐rate N management have revealed no consistent advantages for either strategy in yields achieved, profitability, whole‐field N usage, or N‐use efficiency by plants.”