When the harvest comes, summer corn sowing and post-emergence will be put on the agenda. Summer seedling corn is in high temperature and rainy season, and weeds in corn fields are widespread and varied. According to the results of the annual weed census, there are 22 families, 38 genera, and 43 species of weeds in the corn field. The main weeds include crabgrass, madder, Setaria, goosegrass, amaranthus retroflexus, purslane, iron amaranth, and aconite Wait. Experts suggest that corn is the most seriously affected by weeds at seedling stage, so chemical control of weeds should focus on the two critical periods before and after seedling. What are the single herbicides? Amide herbicides are the most important class of herbicides in corn fields at present. They can be absorbed by weeds. They can be used for soil sealing before weeds sprout, effectively controlling annual weed grass and some annual broad-leaved weeds. There are many varieties of herbicides such as acetochlor, alachlor, butachlor, metolachlor, and isopropyl chloride. Tests have shown that at the same effective dose, the comparison result of herbicidal activity is acetochlor>metolachlor>isopronochlor>butachlor>atrachlor; according to its effective amount, the quantitative comparison result of herbicidal activity is B Oxalamine: Metolachlor: Butachlor: Propisochlor was 1:0.9:0.8:0.7; herbicides of this type were greatly influenced by the locust situation, and the herbicidal effect was significantly reduced when the herbicides were poor. Triazine herbicides can effectively control annual broad-leaved weeds and annual grass weeds. They are mainly absorbed by the roots of weeds and can also be absorbed in small amounts by weed stems and leaves. The representative varieties include Atrazine, Cypermethrin, Simazine, Praxanthin, etc., of which the use of Atrazine is more safe for corn and has the highest activity, but the combination of Insulin and Acetochlor is required to reduce the dosage. , Improve the weeding effect and the safety of post-planting crops. Phenoxycarboxylic acid herbicides are mainly used for the control of broad-leaved weeds and cypermethin in corn seedlings. Representative species are 2 A 4 sodium chloride, 2,4-D butyl ester. Among them, 2A 4 sodium chloride salts are widely used in corn field to control the aconite roots, but the use period is not easy to produce phytotoxicity. The sulfonylurea herbicides nicosulfuron and rimsulfuron can be used to control grassy weeds, sedge weeds and some broad-leaved weeds in corn fields, and thiazolyl can be used to control annual leave in corn fields. Weeds. The other herbicides paraquat and glyphosate are herbicides that can be used for directional spraying after corn is 40 centimeters in height to effectively control a variety of weeds; they can also be used to make it long, herbicidal, bromoxynil, and bentazon. Other varieties control broadleaf weeds in corn fields. What are the herbicide mixtures Acetochlor and Atrazine 1:1 mixture The earliest production of the herbicidal mixture is Ethylene Mixture (Acetonitrile Suspension), which can be used to prevent and control post-emergence maize and early post-emergence corn. Grass and broad-leaved weeds are safe for corn and post-crop crops. Similar products are butachlor + acetochlor + atrazine, butachlor + atrazine, alachlor + acetochlor + atrazine, metolachlor + atrazine, propiprofen + Atazin et al. Acetochlor and Atrazine 2:3 mixture These herbicidal mixtures can be used to control annual grass weeds and broad-leaved weeds in maize fields after corn sowing and in the early post-emergence period of maize, and they are safe for corn; Years may reduce the safety of post-harvest wheat. The similar performance of the variety is chlorotoluron + acetochlor + atrazine mixture, greatly improving the safety of post-planting wheat, but not for post-seedling corn. JIANGSU CLS TECHNOLOGY CORP.LTD , https://www.js-cls.com
Early sowing of summer weeds in corn fields
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