2. Technical measures

(1) Soybean and corn ribbon intercropping

In the southwestern region, rainfall is abundant, and there are many types of weeds, which are difficult to control. Corn is planted before soybeans and herbicide use should be “killed in combination”. After the corn is sown, use metolachlor (or acetochlor) + thifensulfuron-methyl to seal the soil. If there are weeds in the field before the corn is sown, you can use glufosinate-ammonium spray; the soil sealing effect is not ideal If stem and leaf spray treatment is required, nicosulfuron + fluroxypyr (or clopyralid, bentazone) can be used for directional (corn planting area) stem and leaf spray at the 3rd to 5th leaf stage after corn seedlings.

Three days before soybean sowing, glufosinate was selected for directional spraying in empty rows in the field. After sowing and before the seedlings, the soil is sealed with pesticides such as metolachlor (or acetochlor) + thifensulfuron-methyl. If the soil sealing effect is not ideal and spraying of stems and leaves is required, quizalofop-p-p (or high-efficiency fluroxyfop-p-p, fluazifop-p-p, clethodim) + B Carboxyfluorfen (or bentazone) targeted (soybean planting area) stem and leaf spray.

(2) Soybean and corn ribbon intercropping

In Huanghuaihai, the middle and lower reaches of the Yangtze River, and Northwest China, soybeans and corn are sown at the same time, and herbicides are mainly used after sowing and pre-emergence soil sealing treatment, which is required to be completed within 2 days after sowing. Soil sealing is carried out by using the refined metolachlor (or metolachlor, acetochlor) + fensulfame (or thifensulfuron-methyl) and other agents. When the soil is sealed with herbicides in the field where the previous stubble is wheat, it is best to perform rotary tillage to remove stubble, create moisture, and then sow and apply pesticides before planting; for fields where wheat stubble is directly broadcast, it is necessary to increase the water consumption per mu, and apply pesticides if possible. After that, water in time; in areas with drought and sandstorms such as the Northwest, it is best to mix the soil after the application of herbicides, and water in time where conditions permit.

When the soil sealing effect is not ideal and stem and leaf spray treatment is required, it can be used at the 3-5 leaf stage after corn seedlings, 2-3 soybeans at the three-leaf stage, and weeds at the 2-5 leaf stage. According to the local grass conditions, corn can be selected. Nicosulfuron (or oxaflumezone) + bentazone (or fluroxypyr), and soybean fields choose quizalofop-p-ethyl (or high-efficiency fluroxyfop) + bentazone (or fluroxyfen-ethanol) ) Stem-leaf directional spraying for weeding (use physical curtains to separate corn and soybeans for spraying). In the later stage, difficult-to-control weeds can be manually removed.