It is best to choose the east and west directions for compound planting of corn belt, because the light in the east and west directions is better, which is beneficial to photosynthesis. Let's take a look at some better and more reasonable corn and soybean compound planting models.

I. Seed Standards and Variety Selection

1. Summer-sown corn should be middle-early maturity (spring-sown corn is middle-late maturity), with large ears, high yield, good resistance and good commercialization. 2. Summer sowing soybeans should be medium-grained, medium-early-maturing (middle-late-maturing in spring sowing), with high yield, good stress resistance and good quality. 3. Select the national first-class standard corn and soybean seeds with high germination rate and equal germination potential to ensure that the seedlings are complete and tidy and the plant types are consistent.

Second, the planting mode.

Intercropping 1.3 rows of corn and 3 rows of soybean, with row spacing of 60cm and hole spacing of 35cm, with two trees per hole and about 3600 seedlings per mu (1800 holes); The distance between corn and soybean is 40 cm. Soybean row spacing is 40cm, hole spacing is 20cm, and there are two plants in one hole, about 7 100 plants per mu (3550 holes). 2.2 Intercropping four rows of soybeans, the row spacing of corn is about 50 cm, and the hole spacing is about 30 cm, with two plants per hole and about 3,200 plants per mu (1600 holes). The distance between corn and soybean is 40 cm. The soybean row spacing is 40 cm, the hole spacing is 20 cm, there are two plants in one hole, and the seedling yield per mu is about 14000 plants (7000 holes).