Maize (Zea-maize L.) Grain Yield Response to Nitrogen Applied at Different Distances Away from the Row PDF Download
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Author: Jacob P. Vossenkemper
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jacob P. Vossenkemper
Publisher:
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Category :
Languages : en
Pages :
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Author: Daniel Ethan Edmonds
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Category :
Languages : en
Pages :
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Author: Jason Eric Kahabka
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Author: Frederick E. Below
Publisher: MDPI
ISBN: 3038976121
Category : Biology (General)
Languages : en
Pages : 203
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This book is a printed edition of the Special Issue "Environmental and Management Factor Contributions to Maize Yield" that was published in Agronomy
Author: Jorge Hugo Lemcoff
Publisher:
ISBN:
Category :
Languages : en
Pages : 324
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Author: Joshua Nasielski
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Languages : en
Pages :
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With the increasing availability of high clearance equipment, there is growing interest in late N management strategies where a certain proportion of fertilizer N is applied much later in the season than is traditionally done. A suite of experiments was conducted to understand the physiologic response of maize to late N applications. A field experiment was conducted to understand how yield formation in maize is affected by late N management strategies. It was found that the bulk of N fertilizer can be delayed until 9-11 days before silking (V13) without any grain yield penalty. Mechanistically, this is because maize yield potential established just after silking is maximized at relatively low initial N rates. Low N rates become suboptimal in terms of yield only after silking. Thus, on soils which supply at least moderate amounts of indigenous N via mineralization, the bulk of fertilizer N can be applied much closer to silking than traditionally done without yield penalty. A greenhouse study found that the accumulation of luxury N prior to silking can help buffer grain yield against N stresses experienced after silking, and also elucidated the mechanisms responsible for this protective effect. To the extent that late N applications reduce luxury N uptake prior to silking, they may cause maize crops to be less resilient to shortfalls in post-silking N availability. Late N applications presumably increase post-silking N uptake due to greater late-season soil N availability relative to N applications made around planting. A greenhouse study was conducted to better understand how exogenous soil N supply and maize N demand interact to regulate post-silking N uptake in maize. Our data supports a model that characterizes post-silking N uptake as a function of plant source-sink ratio, rather than solely a function of grain yield, post-silking biomass accumulation, or soil N supply. After calibrating and validating the Denitirification and Decomposition (DNDC) computer model, the effects of 16 different N management strategies, including late N applications, on the environmental performance of economically optimum N rates (EONR) was assessed. Late N applications reduced leaching N losses at the EONR modestly (~7 kg N ha-1) but did not reduce yield-scaled N losses. It was found that N source and N placement decisions more strongly affect the agronomic and economic performance of the EONR relative to N timing.
Author: Felizardo Amparano
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author: Nyanguila Muleba
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 180
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Author: Peter Yao Kanze Sallah
Publisher:
ISBN:
Category :
Languages : en
Pages : 216
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Author: Bindeshwari Prasad Pandya
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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