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Maize-soybean strip intercropping: Achieved a balance between high productivity and sustainability

文献类型： 外文期刊

作者： Du Jun-bo 1 ; Han Tian-fu 2 ; Gai Jun-yi 3 ; Yong Tai-wen 1 ; Sun Xin 1 ; Wang Xiao-chun 1 ; Yang Feng 1 ; Liu Jiang 1 ; Shu 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Agron, Minist Agr,Key Lab Crop Ecophysiol & Farming Syst, Sichuan Engn Res Ctr Crop Strip Intercropping Sys, Chengdu 611130, Sichuan, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China

3.Nanjing Agr Univ, Natl Ctr Soybean Improvement, Nanjing 210095, Jiangsu, Peoples R China

关键词： maize; soybean; strip intercropping; high production; agricultural sustainability

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2018 年 17 卷 4 期

页码：

收录情况： SCI

摘要： Intercropping is one of the most vital practice to improve land utilization rate in China that has limited arable land resource. However, the traditional intercropping systems have many disadvantages including illogical field lay-out of crops, low economic value, and labor deficiency, which cannot balance the crop production and agricultural sustainability. In view of this, we developed a novel soybean strip intercropping model using maize as the partner, the regular maize-soybean strip intercropping mainly popularized in northern China and maize-soybean relay-strip intercropping principally extended in southwestern China. Compared to the traditional maize-soybean intercropping systems, the main innovation of field lay-out style in our present intercropping systems is that the distance of two adjacent maize rows are shrunk as a narrow strip, and a strip called wide strip between two adjacent narrow strips is expanded reserving for the growth of two or three rows of soybean plants. The distance between outer rows of maize and soybean strips are expanded enough for light use efficiency improvement and tractors working in the soybean strips. Importantly, optimal cultivar screening and increase of plant density achieved a high yield of both the two crops in the intercropping systems and increased land equivalent ratio as high as 2.2. Annually alternative rotation of the adjacent maize- and soybean-strips increased the grain yield of next seasonal maize, improved the absorption of nitrogen, phosphorus, and potasium of maize, while prevented the continuous cropping obstacles. Extra soybean production was obtained without affecting maize yield in our strip intercropping systems, which balanced the high crop production and agricultural sustainability.

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