Selection of (1) varieties
Soybean variety requirements. We should choose varieties that are resistant to shade, lodging, density, maturity, harvest and high yield. Drought tolerance in flowering and pod setting period and waterlogging tolerance in filling period should be emphasized in Huang-Huai-Hai area, and drought tolerance should be emphasized in northwest and south areas. Corn variety requirements. High-yield varieties with compact plant type, moderate plant height, suitable maturity, density tolerance, lodging resistance and suitable for machine harvesting should be selected in Huang-Huai-Hai area, highlighting the characteristics of high temperature resistance and rust resistance.
(B) determine the model
Considering the density, soil preparation, topography and agricultural machinery conditions of local clean corn and soybean, the suitable row number, row spacing between soybean belt and corn belt, row spacing and plant spacing between two crop belts were determined. Adhere to the 4:2 row ratio configuration, and other rows are 60-70cm apart from soybeans and corn, 30cm apart from soybeans and 40cm apart from corn.
(3) mechanical sowing
Fully ensure that the density of strip-shaped compound planting corn is equivalent to that of net planting, and the density of soybean reaches more than 70% of net planting. The special seeder for soybean-corn belt compound planting is recommended first, and the corresponding technical parameters of the seeder can be adjusted and modified according to the existing seeder and the technical guidelines for the whole mechanization of soybean-corn belt compound planting, which must meet the requirements of soybean-corn belt compound planting.
(4) scientific fertilization
Fertilization should be controlled separately for soybeans and corn, and sufficient nitrogen should be applied for corn, and less or no nitrogen should be applied for soybeans; The fertilizer application amount per plant of strip compound planting corn is the same as that of net planting corn, and the fertilizer application amount of 1 row corn is at least equivalent to 2 rows of net planting corn. Increase the application of organic fertilizer as base fertilizer, appropriately supplement medium and trace elements, and encourage inoculation of soybean rhizobia.
(5) Chemical control
For corn varieties with good water and fertilizer conditions and high plant type, spraying antibiotics, amines, ethephon, etc. Plant height was controlled on 7- 10 leaves. 5% uniconazole wettable powder is mixed with water for soybeans with good fertilizer and water conditions and vigorous growth trend, and the stems and leaves are sprayed from the branching stage (4-5 compound leaves) to the early flowering stage to control vigorous growth.
(6) Pest control
Sowing date control: select disease-resistant varieties. According to the main local root diseases and insect pests (root rot, cyst nematode, underground pests, etc. ), seed coating or chemical seed dressing to prevent and control root seedling diseases and insect pests. Pre-growth prevention and control: during the emergence-branching (trumpet mouth) period, according to the dynamic monitoring of local pests and diseases, the leaf pests and diseases such as whitefly and aphid are mainly prevented and controlled.
(7) Weed control
Closed weeding: under the condition that the soil moisture is suitable after sowing and before germination, spraying metolachlor (or pendimethalin), azosulfuron (or thiophanate-methyl) and other water in windless period within 2 days after sowing. Weeding of stems and leaves: In the 3-5 leaf stage of corn, 2-3 leaf stage of soybean and 2-5 leaf stage of weeds, select dual-purpose herbicides for crops and beans, such as tribenuron-methyl and bentazone for spraying.
(8) mechanical harvesting
If the corn is harvested first, the corn combine with the width of the cutting table between soybean belts less than 10-20cm is selected to harvest the ears or grains, and the soybeans are harvested in time by the local soybean combine or the modified rice-wheat combine. You can harvest soybeans first, and you can choose a soybean combine harvester with the cutting table width between corn belts less than 10-20cm.