When will Wang Mi's herbicide be ready?

Weeds are easy to grow in corn fields, and the normal growth of corn may be affected if weeds appear. Farmers choose to spray corn herbicides to control weeds. So when will the corn herbicide be ready?

When will the Wang Mi herbicide be ready

The suitable period is the period specified in strict accordance with the instructions, selecting the growth period in which weeds are most sensitive to herbicides and maize is most resistant to herbicides, so as to improve the control effect and ensure the safety of seedlings. If it is suitable for the treatment of soil before sowing, it should be used before sowing; if it is suitable for pre-sowing, it should be used before sowing; if it is suitable for stem and leaf treatment, avoid the sensitive period of crops. Timing is to avoid high temperature, high humidity or strong wind, cooling weather, in order to prevent drug damage or reduce drug efficacy, generally should choose sunny and windless weather, medication after 5: 00 pm, safer. Corn is most sensitive to herbicides before budding stage and 1-4 leaf stage, and it is easy to cause drug damage. Attention should be paid to the concentration of herbicides in these growth stages.

II. Types of corn herbicides

1. Amide herbicides: at present, these products are the most important herbicides in corn field, which can be absorbed by weed buds. Soil closure treatment before weed germination can effectively control annual grasses and some annual broad-leaved weeds. There are many kinds of herbicides, such as Acetochlor, alachlor, butachlor, Metolachlor, Metolachlor and so on.

two。 Triazobenzene herbicides: can effectively control annual broad-leaf weeds and annual Gramineae weeds, mainly absorbed by weed roots, but also can be absorbed by weed stems and leaves. The representative varieties are atrazine, cyanazine, simazine, promethazine and so on, among which atrazine is widely used, which is safer to corn and has the highest activity, but atrazine should be mixed with Acetochlor to reduce the dosage and improve the herbicidal effect and safety to the following crops.

3. Phenoxy carboxylic acid herbicides: mainly used to control broad-leaved weeds and aconite after maize seedlings. The representative varieties are 2-methyl-4-chloro-sodium salt and 2.4-murine D-butyl ester. Among them, 2-methyl-4-chloro-sodium salt is widely used to control Cyperus roxburghii in corn field, but it is easy to cause drug damage if it is not used properly.

4. Sulfonylurea herbicides: nicosulfuron and sulfenosulfuron can be used to control Gramineae weeds, Cyperaceae weeds and some broad-leaved weeds in corn fields, and thiazuron can be used to control annual broad-leaf weeds in corn fields.

5. Other herbicides: paraquat and glyphosate are insecticidal herbicides, which can be sprayed after the corn is 40 cm high to effectively control a variety of weeds; it can also be used to control broad-leaf weeds in corn fields, such as paraquat, paraquat, bromobenzonitrile, bentazone, etc.

Corn herbicides should be tailored to the case and decided according to the actual use, otherwise drug damage may occur.