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

The Crop Journal 2021年第1期9卷 168-180页

作者： Yuling Han Wei Ma Baoyuan Zhou Akram Salah Mingjian Geng Cougui Cao Ming Zhan Ming Zhao MOA key Laboratory of Crop Physiology Ecology and Cultivation(The Middle Reaches of Yangtze River)College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina key Laboratory of Crop Physiology and Ecology Ministry of AgricultureInstitute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China College of Resource and Environment Huazhong Agricultural UniversityWuhan 430070HubeiChina

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.

关键词： Maize-rice system Straw return k fertilizer k-use efficiency Quantity/intensity curve

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