China has a wide distribution of corn planting, including spring corn and summer corn. The weed communities in the field vary according to the local natural conditions and farming characteristics. They can be roughly classified into six grassy-damage areas, such as northeast spring corn field weeds and yellow-Huaihai summer corn field weeds. Chemical weeding should be adapted to local conditions and applied scientifically. In order to reduce the residue of atrazine in the soil, the use of atrazine alone is not advocated, and admixture or use of an admixture is advocated.
I. Pre-emergence soil treatment after corn sowing
(1) 40% Yihe Mixture Suspension or 40% Yufeng Suspension, 250-300 ml/mu for North Spring Maize and 150-200 ml/mu for Summer Maize; (2) 90% Goose Cyanide and 38 % Atrazine Suspension Mixture, North Spring Maize 100-150 ml plus 100-150 ml per mu, Summer corn 60-80 ml plus 80 ml per mu; (3) 50% Ethyl Chlorine (Anwei) EC , It is suitable for the spring maize area in northern China and is used with caution in soil with low organic matter content. Use 150-200 ml/mu, 30-50 kg water, spray the soil evenly before seedlings after sowing. When the soil is dry, the amount of water should be increased. Spring corn covered with mulch reduces the dosage by 1/3-1/2. Wheat stubble with higher no-tillage summer corn, with a larger dosage and water consumption.
Second, post-emergence stem and leaf spray treatment
1,40% of Yunong Le suspended concentrate is mixed with 38% atrazine suspension agent. North spring corn is 50-60 ml/acre with 80-100 ml/acre. Summer corn is 50-60 ml/acre with 80 ml/acre. Water 30-50 kg, evenly sprayed on weed stems and leaves in the 3-5 leaf stage of corn.
2, 20% grams of traces of water agent, for the eradication of herbicides, apply to the inter-row corneering protection spray to prevent inter-row weeds. Spring corn coated corn with 150-200 ml per mu after uncovering the film, summer maize 3-5 leaf phase with 100-150 ml per mu, 30-50 kg of water, with fan-shaped fog nozzle plus protective cover for corn Directional spray. Take care not to spray on corn stems and leaves to avoid phytotoxicity.
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