Precautions for sealing herbicides before corn seedlings, can it rain after it rains?

The herbicide before maize seedling refers to the herbicide that should be used after sowing and before emer

Precautions for sealing herbicides before corn seedlings, can it rain after it rains?

The herbicide before maize seedling refers to the herbicide that should be used after sowing and before emergence, which has the function of closed weeding. The ground where herbicide is applied must be flat, and the optimum temperature for sealing herbicide before seedling is 13℃, and it must be used in sunny and windless weather before 10 in the morning. The spraying equipment must be clean and cleaned before spraying to avoid the harm caused by other residual drugs.

First, the precautions for sealing herbicides before corn seedlings

1, the herbicide before maize seedling refers to the herbicide used before maize emergence after sowing, which has a certain closed weeding effect. Taking Ejiao acetochlor as an example, gramineous weeds mainly absorb chemicals through buds, while broad-leaved weeds absorb chemicals through roots and buds, so that young roots of weeds stop growing and die. The duration of Ejiao acetochlor is 40-70 days, and its mobility in soil is relatively small, mainly staying in 1-3 cm soil layer.

2. The ground where herbicide is used must be flat, and the suitable temperature for sealing herbicide before seedling is 13? C, when using, choose sunny and windless weather, generally before 10 in the morning and after 3 pm, which is the most suitable for pesticide application. Because the main part of weed absorbent is bud, it must be applied before weeds are unearthed.

3. The spraying equipment must be clean. Before spraying, the spraying equipment should be cleaned to avoid other drugs remaining on crops. Can I use it when I use it? Secondary dilution method? Use 30-40 first? C, then pouring into a spraying device to be mixed with water, so as to improve the drug effect. Never mix herbicides with cold water directly, or the efficacy will be reduced.

2. Before the corn seedlings are sealed with herbicides, can it rain?

1. The herbicide shall be sealed before the emergence of corn. After the rain, it is mainly based on the time of the rain, that is, how long it rained after the herbicide was finished, to decide whether it is necessary to take measures. If it rains within 6-8 hours after the fight, be sure to spray it again. If it rains after playing for 8 hours, it will generally not affect the efficacy. At the same time, we should also consider the problems of rainfall and duration. If it is light rain and foggy rain, it will rain for a short time, and pesticides will not be greatly affected. If it is a heavy rain or rainstorm, and it lasts for a long time, it must be sprayed again at this time.

2. The dosage of herbicide per unit area before seedling sealing must be determined according to soil texture, soil moisture and other conditions. Generally, chemical agents are used in sandy soil with good soil moisture and low organic matter content, which can be reduced a little within the normal use range. If it is used in high organic matter content, poor soil moisture, cohesive soil or loam, it can be increased a little within the normal use range.

3. Spring sowing corn is usually sown from the end of April to the beginning of May. If the temperature is too low at this time, the activity of herbicides will decrease, resulting in poor weeding effect. In general, when the average outdoor temperature is lower than 15? C. don't spray pesticides. At the same time, the soil moisture using closed herbicides must be better. With the increase of soil moisture, the activity of pesticides will also increase. If the soil is too dry, the weeding effect will be obviously reduced, and if the humidity is too high, phytotoxicity may occur.