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- W2026697100 abstract "Abstract The relationship between nitrous oxide (N 2 O) flux and N availability in agricultural ecosystems is usually assumed to be linear, with the same proportion of nitrogen lost as N 2 O regardless of input level. We conducted a 3‐year, high‐resolution N fertilizer response study in southwest Michigan USA to test the hypothesis that N 2 O fluxes increase mainly in response to N additions that exceed crop N needs. We added urea ammonium nitrate or granular urea at nine levels (0–292 kg N ha −1 ) to four replicate plots of continuous maize. We measured N 2 O fluxes and available soil N biweekly following fertilization and grain yields at the end of the growing season. From 2001 to 2003 N 2 O fluxes were moderately low (ca. 20 g N 2 O‐N ha −1 day −1 ) at levels of N addition to 101 kg N ha −1 , where grain yields were maximized, after which fluxes more than doubled (to >50 g N 2 O‐N ha −1 day −1 ). This threshold N 2 O response to N fertilization suggests that agricultural N 2 O fluxes could be reduced with no or little yield penalty by reducing N fertilizer inputs to levels that just satisfy crop needs." @default.
- W2026697100 created "2016-06-24" @default.
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- W2026697100 date "2005-09-19" @default.
- W2026697100 modified "2023-10-15" @default.
- W2026697100 title "Nonlinear response of N2O flux to incremental fertilizer addition in a continuous maize (Zea mays L.) cropping system" @default.
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- W2026697100 doi "https://doi.org/10.1111/j.1365-2486.2005.01040.x" @default.
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