Straw return increases crop grain yields and K-use efficiency under a maize-rice cropping system

作     者：Yuling Han Wei Ma Baoyuan Zhou Akram Salah Mingjian Geng Cougui Cao Ming Zhan Ming Zhao Yuling Han;Wei Ma;Baoyuan Zhou;Akram Salah;Mingjian Geng;Cougui Cao;Ming Zhan;Ming Zhao

作者机构：MOA Key Laboratory of Crop PhysiologyEcology and Cultivation(The Middle Reaches of Yangtze River)College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina Key Laboratory of Crop Physiology and EcologyMinistry of AgricultureInstitute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China College of Resource and EnvironmentHuazhong Agricultural UniversityWuhan 430070HubeiChina 

出 版 物：《The Crop Journal》 (作物学报（英文版）)

年 卷 期：2021年第9卷第1期

页      面：168-180页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by the Special Fund for Agroscientific Research in the Public Interest of China(201503122) the National Natural Science Foundation of China(31571622) 

主　　题：Maize-rice system Straw return K fertilizer K-use efficiency Quantity/intensity curve 

摘      要：Straw return is an effective way to improve crop grain yield and potassium(K)use efficiency by increasing soil K ***,the effects of straw return on soil K supplying capacity,replacement of K fertilizer,and K-use efficiency under maize(Zea mays L.)–rice(Oryza sativa L.)cropping systems are little studied.A two-year field experiment was conducted to determine the physiological determinants of K-use efficiency under straw return with four K fertilization ***33(straw returned plus 33%of K fertilizer applied)and Sr67(straw returned plus 67%of K fertilizer applied)increased annual crop yields by 1.5%and 3.2%and increased agronomic K-use efficiency by respectively 2.9 and 1.3-fold on average in the two years,compared with the conventional practice S0K100(no straw returned plus normal amounts of K fertilizer applied).The Sr33 and Sr67 treatments resulted in significantly greater equilibrium K concentration ratios(CR0 K)and specifically exchangeable K(KX)values according to quantity/intensity(Q/I)relationship analyses,indicating improvement of the potential soil K supply ***,the Sr67 better maintained the soil exchangeable K level and K *** results suggested that K released from maize and rice straw can replace about half of chemical K fertilizer,depending on the available K content in maize–rice cropping system production.