What should be paid attention to when chemical weeding is used in corn field?

What should be paid attention to when chemical weeding is used in corn field? Please introduce that at present, the area of chemical weeding in corn field accounts for about 70% of the sown area of corn, and most of the herbicides used in production are atrazine plus Acetochlor or its compound. however, because atrazine has the characteristics of long residual effect and poses a threat to the safety of the following crops, it is not conducive to changing stubble. In addition, atrazine can pollute groundwater and pose a threat to people and crops. Based on the above reasons, some herbicides and methods to replace atrazine are being screened and used in production. There are mainly 24-D butyl ester or 24-D butyl ester, nicosulfuron (Yunongle), paraquat (gram without trace) and so on. The following is an introduction to farmers on the methods and matters needing attention of chemical weeding in corn fields. First, soil closure before seedling after sowing 1, using 38% atrazine 250ml / mu + 90% Acetochlor (Acetochlor) 100ml / mu in corn after sowing before seedling soil closure. 2. Note: because atrazine is a long residual herbicide, it will cause certain drug damage to the next crop sensitive crops, but it will not cause serious drug damage to the following crops when the dosage per mu cannot exceed 250ml. 3. 200 g / mu of Fengshu No. 1 EC containing 2.4 Mel D butyl ester was used to seal the soil before seedling after corn sowing. 4. Note: some farmers use 2.4 murine D butyl ester to spray corn stems and leaves. Because 2.4 murine D butyl ester is a hormone herbicide, the technical requirements of spraying corn seedlings after stem and leaf spraying are very strict, and it is not easy to grasp. Spraying will make corn plants brittle and easy to break, form tumors at internodes, and affect yield. It is suggested that 2.4 murine D butyl ester should not be used to spray corn stems and leaves. In addition, because 2.4 Mel D-butyl is highly volatile, it is easy to cause drug damage to nearby sensitive crops such as beans and melons in windy days, so we must choose a windless day. Second, post-seedling stem and leaf spray 1, 4% nicotinosulfuron (Yunongle) 50ml / mu + 38% atrazine 100ml / mu, stem and leaf spray in Gramineae weed 3Mel 5-leaf stage. 2. Note: 4% nicosulfuron is sensitive to some corn varieties and cannot be used on sweet corn and sticky corn. 3. Soil closure before seedling, directional spraying between rows after seedling 1. After corn sowing, 100 ml / mu of soil was sealed with 90% Acetochlor before seedling, and then 150 ml of 20 g water-free agent was sprayed between rows during the period from 6 leaves of corn to 10 ml of weeds before row closure. 2. Note: gram without trace is an extinct herbicide, which can not be sprayed on green crops. You can only spray weeds on ridges with a protective cover on the sprinkler, and then cover the weeds among seedlings on the ground. Click to get more corn planting techniques click to get more herbicide application techniques click to get more pesticide application techniques