Rainy summer, weeds occur in corn fields, the main weeds are crabgrass, madder, Setaria viridis, goosegrass, Amaranthus retroflexus, purslane, iron amaranth, aconite and so on. Corn seedlings are most seriously harmed by weeds, so chemical control of weeds should focus on the two critical periods before and after seedling. First, the main herbicide single agent species 1. Amide Herbicides: These products are the most important class of herbicides in corn fields at present and can be absorbed by weed buds. They are used for soil sealing before weeds germinate. They can effectively control annual grass weeds and some annual ones. Broad-leaved weeds. There are many varieties of herbicides such as acetochlor, alachlor, butachlor, metolachlor, and isopropyl chloride. 2. Triazine herbicides: It can effectively control annual broad-leaved weeds and annual grass weeds. It is mainly absorbed by the roots of weeds, and can also be absorbed by a small amount of weed stems and leaves. Representative varieties are Atrazine, Cypermethrin, Simazine, Prasoxam, etc., of which Atrazine is used more, it is safer and has the highest activity for corn. When mixed with acetochlor it can reduce the dosage and increase the weeding effect and茬 The safety of crops. 3. Phenoxycarboxylic acid herbicides: Mainly used in the post-emergence control of broadleaf weeds and cyperus rotundus. 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. 4. Sulfonylurea herbicides: Nicosulfuron, rimsulfuron can be used to control grassy weeds, Cyperaceae weeds and some broad-leaved weeds in corn fields; thiadicarb can be used for corn field control Annual broadleaf weeds. 5. Other herbicides: Paraquat and glyphosate are all-emergent herbicides. They can be sprayed after corn is 40 centimeters in height to effectively control a variety of weeds; they can also be used to make it long, herbicide, bromoxynil, Bentazon and other varieties control broadleaf weeds in corn fields. Second, pay attention to several issues Herbicide varieties were selected based on corn varieties. The use of closed pre-emergence requires good soil moisture and sufficient water for use. With post-emergence herbicides, attention should be paid to the age of seedlings, except for certain herbicides that are relatively safe. Herbicides and insecticides must not be mixed arbitrarily. Herbicides with low prices generally have low content of active ingredients, poor efficacy and unsafeness, and some contain 2.4 butyl esters or dimethyl tetrachlorine, which are easy to produce phytotoxicity.
Ganoderma Lucidum Spore Oil Softgel (Reishi mushroom spore oil softgel) uses organic shell-broken Ganoderma
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Recommended
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Ganoderma Lucidum Spore Oil Softgel,Reishi Spore Oil,Ganoderma Oil Ganoherb International Inc. , http://www.ganoherb.us
Selection and Application of Herbicides in Maize Field