How long after the corn herbicide is finished? it's okay to rain.

There are many farmers who do not pay attention to the weather forecast when spraying corn herbicides, and rain occurs after spraying. So how long after the corn herbicide does it rain?

1. How long after the corn herbicide? it's okay to rain.

It depends on the time of rain, that is, how long it rains after shooting the herbicide, and if there is an interval of more than 6 hours, there is no need to re-spray, the weeds have already absorbed the liquid, for example, if you take the medicine in the afternoon and it begins to rain at night, it basically doesn't matter, if you have just given the medicine in the morning, it begins to rain after noon, or just after a sudden shower, in this case In the next step of judgment.

According to the question of rainfall and duration, that is, heavy rain, heavy rain, light rain or foggy rain, if it is light rain and misty rain, and it falls for a relatively short time, it will not be greatly affected, on the contrary, if it is heavy rain or rainstorm, it will last for a long time. At this time, we should consider whether to spray again.

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 herbicide variety is rich and varied, select the right herbicide, and use it scientifically and rationally, and pay attention to the weather forecast before spraying, we can achieve better results.