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DOI10.1007/s10705-020-10046-0
Reducing nitrous oxide emissions and optimizing nitrogen-use efficiency in dryland crop rotations with different nitrogen rates
Sainju U.M.; Ghimire R.; Mishra U.; Jagadamma S.
发表日期2020
ISSN13851314
起始页码381
结束页码395
卷号116期号:3
英文摘要Recent interests in improving agricultural production while minimizing environmental footprints emphasized the need for research on management strategies that reduce nitrous oxide (N2O) emissions and increase nitrogen-use efficiency (NUE) of cropping systems. This study aimed to evaluate N2O emissions, annualized crop grain yield, emission factor, and yield-scaled- and NUE-scaled N2O emissions under continuous spring wheat (Triticum aestivum L.) (CW) and spring wheat–pea (Pisum sativum L.) (WP) rotations with four N fertilization rates (0, 50, 100, and 150 kg N ha−1). The N2O fluxes peaked immediately after N fertilization, intense precipitation, and snowmelt, which accounted for 75–85% of the total annual flux. Cumulative N2O flux usually increased with increased N fertilization rate in all crop rotations and years. Annualized crop yield and NUE were greater in WP than CW for 0 kg N ha−1 in all years, but the trend reversed with 100 kg N ha−1 in 2013 and 2015. Crop yield maximized at 100 kg N ha−1, but NUE declined linearly with increased N fertilization rate in all crop rotations and years. As N fertilization rate increased, N fertilizer-scaled N2O flux decreased, but NUE-scaled N2O flux increased non-linearly in all years, regardless of crop rotations. The yield-scaled N2O flux decreased from 0 to 50 kg N ha−1 and then increased with increased N fertilization rate. Because of non-significant difference of N2O fluxes between 50 and 100 kg N ha−1, but increased crop yield, N2O emissions can be minimized while dryland crop yields and NUE can be optimized with 100 kg N ha−1, regardless of crop rotations. © 2020, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
英文关键词Crop production; Dryland cropping systems; Emission factor; Management practices; N2O flux; Nitrogen rate
scopus关键词agricultural production; crop rotation; crop yield; emission; management practice; nitrogen; nitrogen cycle; nitrous oxide; wheat; Pisum sativum; Triticum aestivum
来源期刊Nutrient Cycling in Agroecosystems
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/176940
作者单位Northern Plains Agricultural Research Laboratory, Agricultural Research Service, USDA, Sidney, MT 59270, United States; Agricultural Science Center, New Mexico State University, Clovis, NM 88101, United States; Environmental Science Division, Argonne National Laboratory, Argonne, IL 60439, United States; Department of Biosystem Engineering and Soil Science, University of Tennessee, Knoxville, TN 37996, United States
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Sainju U.M.,Ghimire R.,Mishra U.,et al. Reducing nitrous oxide emissions and optimizing nitrogen-use efficiency in dryland crop rotations with different nitrogen rates[J],2020,116(3).
APA Sainju U.M.,Ghimire R.,Mishra U.,&Jagadamma S..(2020).Reducing nitrous oxide emissions and optimizing nitrogen-use efficiency in dryland crop rotations with different nitrogen rates.Nutrient Cycling in Agroecosystems,116(3).
MLA Sainju U.M.,et al."Reducing nitrous oxide emissions and optimizing nitrogen-use efficiency in dryland crop rotations with different nitrogen rates".Nutrient Cycling in Agroecosystems 116.3(2020).
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