Does the heavy rain of herbicides still work after sowing seedlings in corn fields?

If it rains after 6 hours, corn herbicide is effective. Rain has little effect on the efficacy at this time. This herbicide has been absorbed by weeds and is very effective. When spraying herbicides, you should first look at the weather forecast. If it rains recently, don't hit it first, so as not to spray it after it is ineffective. Generally, if it doesn't work, you should spray it again.

The best spraying time of corn herbicide is after 6 o'clock in the evening, because the temperature is lower and the humidity is higher after spraying, and the liquid medicine stays on the weeds for a long time, so that the weeds can fully absorb the herbicide components and ensure the weeding effect. Applying herbicides at night can also significantly improve the safety of maize seedlings and prevent phytotoxicity.

Extended data:

Matters needing attention in the use of corn herbicides:

Generally, it is used before maize emergence after sowing, or early after maize emergence. During this period, weeds are in the seedling stage, and contact with pesticides is easy to die. The effect of spraying pesticides after weeds emerge will be unsatisfactory. It is best to use a sprayer with sufficient water and even spraying. Do not re-spray or miss spraying, and avoid spraying in windy weather.

The best spraying time of herbicide after maize seedling is 2 ~ 5 leaves, at this time, maize has strong resistance and is not easy to be harmed. It can be sprayed all over the field before the fifth leaf and after the sixth leaf. It is necessary to lower the nozzle and spray around the corn seeds to prevent the drug damage caused by liquid medicine perfusion.