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- W3182034749 abstract "Abstract Cover crop species and termination date could affect fertilizer‐nitrogen (N) management and N diagnostic methods traditionally used in bare fallow‐maize ( Zea mays L.) systems. Our objectives were to (a) assess the effect of cover crop termination date on maize yield and response to fertilizer‐N, (b) determine maize yield at varying N rates following different cover crop species and mixtures, and (c) evaluate the chlorophyll meter reading (CMR), grain N concentration (N c ), and grain N nutrition index (NNI) as N diagnostic methods. Experiments were conducted at four sites in the southeastern Argentinean Pampas with maize planted after cover crops. Factors investigated were cover crops with vetch ( Vicia villosa Roth), vetch–oat ( Avena sativa L.) mixture, or bare fallow; early termination of cover crops or ∼3 wk later; and maize fertilizer‐N at 0, 50, 100, and 200 kg N ha –1 . The minimum N rate that maximized grain yield was higher in vetch–oat mixture (100 kg N ha –1 ) than in vetch (50 kg N ha –1 ). Maize yield was not affected by cover crops with 200 kg N ha –1 . Late termination dates of vetch–oat mixture reduced maize yield by 15% compared with early termination dates, while there was no effect of vetch termination date. Cover crop termination date did not affect yield response to fertilizer‐N. Relative CMR at silking, grain N c , and especially grain NNI at maturity were useful tools to diagnose maize N status and cover crop effect. Cover crop management should be considered to adjust the fertilizer N rate and optimize maize productivity." @default.
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- W3182034749 date "2021-09-27" @default.
- W3182034749 modified "2023-10-01" @default.
- W3182034749 title "Cover crop species can increase or decrease the fertilizer‐nitrogen requirement in maize" @default.
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- W3182034749 doi "https://doi.org/10.1002/agj2.20791" @default.
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