Good effect of weeding before and after seedling of summer corn
Summer corn is generally sown in early June. During this period, the temperature was higher, and the weeds grew faster. After 10 days of general sowing, they reached the peak of emergence. After 15 days, the number of emergences reached 90% of the total. Because corn is small in the seedling stage, it is vulnerable to weeds. If it is not controlled in time, it will easily form grass shortages, which will seriously affect the yield. Before weeding, weeding and weeding in soil can eliminate weeds in the bud and achieve long-term control of weeds. Even if the weeds have been unearthed, the seedlings are very small, more sensitive to herbicides and easier to control. To do well in the weeding work in summer corn fields, we must master the following points: 1. Scientifically select herbicides. Suitable herbicides for post-emergence application, good herbicidal effect and high economic benefit include 40% EtOH, 72% Dole EC, 40% EtOH, 50% acetochlor, and 50% DHA. These herbicides generally control more than 80% of grass weeds and broad-leaved weeds. 2, scientific master drug dosage. When the dosage is small, the effect of weeding is poor and the ideal effect cannot be achieved; when the dosage is large, it is easy to produce phytotoxicity, and the cost is increased and the economic benefit is reduced. Therefore, when herbicides are applied before seeding after sowing, care should be taken to control the dosage. Under normal circumstances, the dosage of 40% Ethylene mixture is 180-200 ml per mu, 50% acetochlor is suitable for 80 ml per mu, and the amount of 72% Duyun EC is 175 per mu. - 200 ml is appropriate. The dosage of 40% acetylcholine mixture is 150-200 ml per mu, and the amount of 50% Ding A mixture is 300 ml per mu. 3, master the water consumption and dilution method. In the case of power-assisted mechanical spraying, the amount of water used is 30 kg per mu, and when artificial spray is used, the amount of water used is 50 kg per mu. If the soil is dry, the amount of water can be increased to improve the weeding effect. When diluting the herbicide, a secondary dilution method must be adopted, ie, the herbicide is first diluted into a mother liquor and then diluted with water to a desired concentration. 4, scientific understanding of the mode of application and application period. Spraying should be sprayed evenly on the surface of the soil so as not to spray or re-spray, and cultivators should be banned after spraying so as not to damage the closed surface layer. The determination of the application period should be strictly controlled within 1-3 days after sowing, so as to avoid phytotoxicity to the seedlings if the application is too late. 5. Pay attention to local weather forecast. When herbicides are applied, they should not be carried out before heavy rain, so as to prevent heavy rain from damaging the application layer, and it is advisable to apply the pesticide without wind or breeze in order to avoid the drift of droplets and endanger the sensitive crops around them.