title: Chinese Milk Vetch as Green Manure Mitigates Nitrous Oxide Emission from Monocropped Rice System in South China.
abstract: Monocropped rice system is an important intensive cropping system for food security in China. Green manure (GM) as an alternative to fertilizer N (FN) is useful for improving soil quality. However, few studies have examined the effect of Chinese milk vetch (CMV) as GM on nitrous oxide (N2O) emission from monocropped rice field in south China. Therefore, a pot-culture experiment with four treatments (control, no FN and CMV; CMV as GM alone, M; fertilizer N alone, FN; integrating fertilizer N with CMV, NM) was performed to investigate the effect of incorporating CMV as GM on N2O emission using a closed chamber-gas chromatography (GC) technique during the rice growing periods. Under the same N rate, incorporating CMV as GM (the treatments of M and NM) mitigated N2O emission during the growing periods of rice plant, reduced the NO3- content and activities of nitrate and nitrite reductase as well as the population of nitrifying bacteria in top soil at maturity stage of rice plant versus FN pots. The global warming potential (GWP) and greenhouse gas intensity (GHGI) of N2O from monocropped rice field was ranked as M<NM<FN. However, the treatment of NM increased rice grain yield and soil NH4+ content, which were dramatically decreased in the M pots, over the treatment of FN. Hence, it can be concluded that integrating FN with CMV as GM is a feasible tactic for food security and N2O mitigation in the monocropped rice based system.
authors.affiliation: Institute of Soil & Fertilizer and Resources & Environment, National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi, P.R. China.|College of Resources and Environment, Microelement Research Center, Huazhong Agricultural University, Wuhan, Hubei, P.R. China.|Hubei Collaborative Innovation Center for Grain Industry, Jingzhou, Hubei, P.R. China.
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Institute of Soil & Fertilizer and Resources & Environment, National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi, P.R. China.|Department of Agriculture, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan.
authors.forename: Farooq
authors.initials: F
authors.lastname: Shah
authors.affiliation: College of Resources and Environment, Microelement Research Center, Huazhong Agricultural University, Wuhan, Hubei, P.R. China.|Hubei Collaborative Innovation Center for Grain Industry, Jingzhou, Hubei, P.R. China.
authors.forename: Shuxin
authors.initials: S
authors.lastname: Tu
authors.affiliation: Institute of Soil & Fertilizer and Resources & Environment, National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi, P.R. China.
authors.forename: Changxu
authors.initials: C
authors.lastname: Xu
authors.affiliation: Institute of Agricultural Resources and Regional Planning, CAAS, Beijing, P.R. China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Cao
mesh_terms: D002681:China; D000069599:Crop Production / Q000379:methods*; D007887:Fabaceae / Q000254:growth & development* / Q000378:metabolism; D017752:Greenhouse Effect / Q000517:prevention & control*; D058458:Nitrogen Cycle; D009609:Nitrous Oxide / Q000378:metabolism*; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D012987:Soil / Q000737:chemistry
chemical_list: D012987:Soil; D009609:Nitrous Oxide