气候变化领域集成服务门户(CCPortal): Reduction of nitrogen fertilizer requirements and nitrous oxide emissions using legume cover crops in a No-tillage sorghum production system

CCPortal

DOI	10.3390/su12114403
	Reduction of nitrogen fertilizer requirements and nitrous oxide emissions using legume cover crops in a No-tillage sorghum production system
	Mahama G.Y.; Prasad P.V.V.; Roozeboom K.L.; Nippert J.B.; Rice C.W.
发表日期	2020
ISSN	20711050
卷号	12 期号:11
英文摘要	Nitrous oxide (N2O) emission from denitrification in agricultural soils often increases with nitrogen (N) fertilizer and soil nitrate (NO3-) concentrations. Our hypothesis is that legume cover crops can improve efficiency of N fertilizer and can decrease N2O emissions compared to non-cover crop systems. The objectives of this study were to (a) evaluate the performance of summer leguminous cover crops in terms of N uptake and carbon (C) accumulation following winter wheat and (b) to quantify the effects of summer leguminous cover crops and N fertilizer rates on N2O emissions and grain yield of the subsequent grain sorghum crop. Field experiments were conducted in the context of a wheat-sorghum rotation for two seasons in Kansas. Treatments consisted of double-cropped leguminous cover crops following winter wheat harvest with no fertilizer applied to the following grain sorghum or no cover crop after wheat harvest and N fertilizer rates applied to the grain sorghum. The cover crops were cowpea (Vigna unguiculata L. Walp.), pigeon pea (Cajanus cajan L. Millsp.), and sunn hemp (Crotalaria juncea L.). The three N treatments (were 0, 90, and 180 kg·N·ha-1). Fallow systems with 90 and 180 kg·N·ha-1 produced significantly greater N2O emissions compared with cropping systems that received no N fertilizer. Emissions of N2O were similar for various cover crops and fallow systems with 0 kg·N·ha-1. Among cover crops, pigeon pea and cowpea had greater C accumulation and N uptake than sunn hemp. Grain yield of sorghum following different cover crops was similar and significantly higher than fallow systems with 0 kg·N·ha-1. Although fallow systems with 90 and 180 kg·N·ha-1 produced maximum sorghum grain yields, N2O emissions per unit of grain yield decreased as the amount of N fertilizer was reduced. We conclude that including leguminous cover crops can decrease N fertilizer requirements for a subsequent sorghum crop, potentially reducing N2O emissions per unit grain yield and providing options for adaptation to and mitigation of climate change. © 2020 by the authors.
英文关键词	Cover crops; Crop rotation; Cropping system; Greenhouse gas emissions; Legumes; Nitrogen management; Nitrous oxide; Sorghum
scopus关键词	agricultural emission; agricultural soil; bioaccumulation; concentration (composition); cover crop; crop yield; denitrification; farming system; fertilizer application; harvesting; legume; nitrous oxide; sorghum; wheat; Kansas; United States; Cajanus cajan; Crotalaria juncea; Sorghum bicolor bicolor; Triticum aestivum; Vigna unguiculata
来源期刊	Sustainability (Switzerland)
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176903
作者单位	Department of Agronomy, 2004 Throckmorton Plant Science Center, Kansas State University, Manhattan, KS 66506, United States; Council for Scientific and Industrial Research-Savanna Agricultural Research Institute, P.O. Box 494, Wa, Ghana; Division of Biology, Kansas State University, 116 Ackert Hall, Manhattan, KS 66506, United States
推荐引用方式 GB/T 7714	Mahama G.Y.,Prasad P.V.V.,Roozeboom K.L.,et al. Reduction of nitrogen fertilizer requirements and nitrous oxide emissions using legume cover crops in a No-tillage sorghum production system[J],2020,12(11).
APA	Mahama G.Y.,Prasad P.V.V.,Roozeboom K.L.,Nippert J.B.,&Rice C.W..(2020).Reduction of nitrogen fertilizer requirements and nitrous oxide emissions using legume cover crops in a No-tillage sorghum production system.Sustainability (Switzerland),12(11).
MLA	Mahama G.Y.,et al."Reduction of nitrogen fertilizer requirements and nitrous oxide emissions using legume cover crops in a No-tillage sorghum production system".Sustainability (Switzerland) 12.11(2020).