Production Benefits of Double-Cropping Rice Under Optimized Application of Nitrogen and Potassium Fertilizers Combined with Chinese Milk Vetch and Straw Co-Returning to Fields

作     者：DONG Chun-hua MA Chao-hong HU Ke-xin HE Yun-long LI Wan-min CHU Fei YANG Zeng-ping 董春华;马朝红;胡柯鑫;何云龙;李万民;褚飞;杨曾平

作者机构：Hunan Institute of Soil and FertilizerChangsha 410125PRC Institute of Plant Protection and Soil FertilizerHubei Academy of Agricultural SciencesWuhan 430064PRC Agricultural Technology Extention Center of Anxiang CountyAnxiang 415600PRC 

出 版 物：《Agricultural Science & Technology》 (农业科学与技术（英文版）)

年 卷 期：2021年第22卷第1期

页      面：17-25页

学科分类：09[农学] 0901[农学-作物学] 

基　　金：国家重点研发计划(2016YFD0201306,2016YFD0200809) 长财教指〔2019〕157号(kq1907052) 

主　　题：Double-cropping rice Optimized application of nitrogen and potassium fertilizers Chinese milk vetch and straw co-returning to fields Rice yield Soil physical and chemical properties 

摘      要：In order to explore the technology and effects of reducing nitrogen and potassium fertilizer applications in double-cropping rice,a field plot experiment was conducted to study the effects of optimized application of nitrogen and potassium fertilizers combined with returning Chinese milk vetch and straw to fields on yield,fertilizer utilization efficiency,net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO_(2) concentration(Ci),chlorophyll content(SPAD value)and soil physical and chemical properties in late rice harvest *** results showed that the optimized application of nitrogen and potassium fertilizers combined with the integrated technology of Chinese milk vetch and straw co-returning to the field could enhance the photosynthetic efficiency of double-cropping rice,increase rice yield,and enhance soil biological activity,especially T4 treatment involving the returning of Chinese milk vetch and straw to the field instead of 30%nitrogen fertilizer achieved the highest rice yield,fertilizer use efficiency,net photosynthetic rate and soil biological *** with the conventional fertilization treatment T2,the total rice yield of T4 treatment increased by 4.1%,among which the early rice and late rice increased by 6.3%and 2.4%,respectively;Pn,Gs and SPAD values of flag leaves at full heading stage significantly increased,and the contents of soil active organic carbon,alkali hydrolyzed nitrogen,available phosphorus and readily available potassium significantly increased.