Optimization on Plant Row and Spacing Configuration of Maize and Soybean under 1∶ 2 Intercropping Planting Model

The intercropping of maize and soybean is popular in the mountain area of Southwest China. In this paper,after screening out 1∶ 2 as the best row ratio of maize to soybean,the detailed plant configuration was investigated. Plant space of soybean,row space between soybeans or between soybean and maize all had no significant effect on soybean yield,but extremely significant on maize yield. The tested factors and their interaction influenced total output of maize and soybean significantly.The optimized plant configuration were 25 cm between soybean rows and 10 cm between soybean plants,30 cm row space between soybean and maize,and 25 cm between maize plants. Under this planting mode,the planting density of maize and soybean were 4. 71 × 104and 23. 54 × 104plants·ha- 1,their yield were 10 074. 88 and 1 168. 44 kg·ha- 1,respectively. The total output of maize and soybean was 34 752. 84 yuan·ha- 1,and the contribution rate of soybean was 18. 82%。