What kind of herbicide should be used for corn?

What herbicide is good for corn? How to use it? Summer rainy, corn field weeds occur widely, the main weeds are crabgrass, barnyardgrass, Setaria, goosegrass, amaranth, purslane, amaranth, Cyperus rotundus and so on. Weeds harm maize seedling most seriously, so chemical control of weeds should pay attention to two key periods after sowing before seedling and early after seedling. I. Main herbicide single agent types 1. Amide herbicides: This product is the most important herbicide in corn field at present. It can be absorbed by weed bud. It can effectively control annual grass weeds and some annual broadleaf weeds by soil sealing treatment before weed germination. There are many kinds of herbicides, such as acetochlor, alachlor, butachlor, metolachlor, isopropachlor, etc. 2. Triazobenzene herbicides: can effectively control annual broadleaf weeds and annual grass weeds, mainly absorbed by weed roots, but also can be absorbed by weed stems and leaves. Representative varieties include atrazine, cyanazine, simazine, promethazine, etc. Among them, atrazine is used more, which is safer to corn and has the highest activity. Mixed with acetochlor, it can reduce the dosage, improve the weeding effect and safety to the next crop. 3. Phenoxy carboxylic acid herbicides: mainly used for corn seedling control broadleaf weeds and cyperus rotundus. Representative varieties are 2-methyl-4-chloride sodium salt, 2,4-D butyl ester. Among them, 2-methyl-4-sodium chloride is widely used to control Cyperus rotundus in corn field, but it is easy to cause phytotoxicity if it is not used at the right time. 4. Sulfonylurea herbicides: nicosulfuron and rimsulfuron can be used to control gramineous weeds, cyperaceae weeds and some broadleaf weeds in corn fields; thisulfuron can be used to control annual broadleaf weeds in corn fields. 5. Other herbicides: paraquat and glyphosate are genocidal herbicides that can be sprayed directionally after corn is 40 cm high to effectively control a variety of weeds; it can also be used to control broadleaf weeds in corn fields, such as talon, paraquat, bromoxynil and bentazon. Second, pay attention to several problems according to corn varieties to select herbicide varieties. The use of closed seedlings, soil moisture requirements, the use of sufficient water. When using post-seedling herbicides, pay attention to seedling age. Except for some herbicide varieties, most of them should be paid attention to. Do not mix herbicides and pesticides arbitrarily. Cheap herbicides generally have low active ingredient content, poor effect, unsafe, and some contain 2.4 butyl ester or dimethyltetrachlorine, which is easy to cause phytotoxicity. Click to view more corn planting techniques Click to view more herbicide application techniques Click to view more pesticide application techniques