If it rains after two hours of corn herbicide, will it have no effect?

The application of post-seedling weeding has a certain impact on the growth of post-seedling crops, and if the use of post-emergence herbicides in maize is improper, it is easy to affect the normal growth of maize post-emergence crops. However, during the growth of corn, many farmers have just finished spraying corn herbicide and it rains, in this case, do they still use re-spraying herbicide the next day? If it is sprayed again, will it affect the normal growth of corn?

I believe that there will be many friends who have applied corn herbicide 2 times or more times, in fact, this practice is not recommended. Therefore, today's article below is a reminder to friends who have not yet played or are ready to apply herbicides, and it is not recommended to play herbicides after corn seedlings for a second time.

Some people will ask, after I have applied herbicide, it suddenly rains, can this situation be resprayed? Otherwise, the grass will not die, which will affect the normal growth of corn, what should I do?

In response to this problem, it should also be treated on a case-by-case basis, let's take a look:

1. It rains within 6 hours after the injection.

2. After the medicine, it rains heavily or rains in a short period of time, and it lasts for a long time, and there is water in the fields.

3. After the medicine, it rained, and for about 5 days, there was no sign of poisoning in the broad-leaved grass in the field, and for about 7 days, there were no signs of poisoning in the sharp-leaved grass.

If it is the above 3 cases, you can respray it once, but you should pay attention to the dosage and do not increase the amount privately.

On the contrary: if it rains after the corn is sprayed with herbicides, these 3 conditions can not be resprayed, and it will not affect the normal growth of corn.

1. It rains 6 hours after the medicine.

2. After the medicine, the rain is not large, and the duration is short.

3. After the injection, about 5 days, broad-leaved and sharp-leaved grass have been poisoned.

In the above 3 cases, it is not recommended to re-spray, because it has little impact on the efficacy, and it has been effective, if it is sprayed again, it will be due to the excessive amount of herbicide, resulting in the appearance of pesticide damage, affecting the normal growth of corn, serious and even no harvest.

In order to avoid herbicide residues, many people choose to spray Alphago herbicide safety control agents.

After two hours of corn herbicide spraying, it rains, will you have an effect? Now the herbicide is very good, as long as it does not rain within half an hour, it is best not to rain for a day, it works very well, it is slower within two hours, there is a problem that works, in the future, you must first look at the weather forecast, and then go to the herbicide, or what is it? It's better if it doesn't rain, but if it rains all day, or it's raining for several days, it's better, but that's okay, if you're already two hours later and then it rains heavily.

Then it's up to him to explain. What to hit when to see laughter. Some herbicides are effective. It should be no problem. There are herbicides. It is more effective after hitting the rain.

After spraying, it generally rains every 4 5 hours without spraying, if it is a contact insecticide every 3 hours, it does not need to be sprayed, if it is a systemic effect, the fungicide is best to rain 5 hours after the application of the effect is better, but some fungicides do not need to be sprayed in the drizzle, so according to the actual situation, there is no unified standard.

Because it takes 2 6 hours of absorption process after post-emergence herbicide spraying to maize, in these 2 6 hours, whether the effect of the herbicide is good or not (that is, whether the weeding effect is ideal) is very closely related to the temperature and air humidity. Spraying in the morning, noon or afternoon when the temperature is high and the weather is dry, due to the high temperature, strong light, the liquid volatilization is fast, and the liquid will evaporate after a while after spraying, so that the amount of herbicide entering the weed body is limited, and the absorption is obviously insufficient, which affects the effect of weeding.

At the same time, spraying pesticides in high temperature and drought makes corn seedlings also prone to pesticide damage. The best spraying time is after six o'clock in the evening, because at this time spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the weed leaf surface for a longer time, the weeds can fully absorb the herbicide components, ensure the weeding effect, and the evening medicine can also significantly improve the safety of corn seedlings, and it is not easy to cause pesticide damage.

Apply pesticides at the right time and at the right time:

The appropriate period is to choose the growth period when weeds are most sensitive to herbicides and corn has the strongest resistance to herbicides, so as to improve the control effect and ensure the safety of seedlings. If it is suitable for pre-sowing treatment of soil, it should be used before sowing; If it is suitable for use before sowing seedlings, it should be used before sowing seedlings; If it is suitable for stem and leaf treatment, it is necessary to avoid the sensitive period of crops. The time is to avoid high temperature, high humidity or strong wind, cooling weather, in order to prevent drug damage or reduce the efficacy of the drug, generally should choose sunny and windless weather, after 5 p.m., it is safer.

Corn is most sensitive to herbicides before the budding stage and the 1-4 leaf stage, and it is easy to produce pesticide damage, and the concentration of herbicides should be paid attention to when applying herbicides at these growth stages. Sprayers and other utensils that have been sprayed with herbicides should be soaked in alkaline water or special cleaning agents in time after use, and cleaned many times to prevent pesticide damage in the use of other crops, and it is best to use special sprayers.

Summary. Hello pro-corn after the herbicide encounters rain, you need to observe the duration of the rain, if it is just a shower, a few minutes, dozens of minutes to stop, the impact on the herbicide is limited. If it rains continuously for several hours, in this case, the weeding effect will basically be reduced.

If it rains after two hours of corn herbicide, will it have no effect?

Hello pro-corn after the herbicide encounters rain, you need to observe the duration of the rain, if it is just a shower, a few minutes, dozens of minutes to stop, the impact on the herbicide is limited. If it rains continuously for several hours, in this case, the weeding effect will basically be reduced.

In addition to the above two points, it is also necessary to consider the size of the rainfall, if it is light rain, it will have a limited effect on the effect of the herbicide. On the contrary, if it is heavy rain, or even heavy rainfall, the herbicide solution is washed away by the rain, and the weeding effect is basically limited.

From the actual planting situation, it is necessary to combine the above three aspects to draw the following conclusions. First, if the corn encounters a rainy day after the herbicide, the interval is less than 6 hours, the rainfall is large, and the duration is long, in order to improve the weeding effect, you can wait for the weather to clear and re-spray again. Second, if the corn encounters a rainy day after the herbicide, the rainfall is small, the duration is not long, and the interval is greater than 12 hours, there is no need to spray the herbicide again, the herbicide has played a role, and spraying again may cause pesticide damage to corn.

In fact, in addition to the above two conclusions, there may be a better answer, that is, when the corn encounters a rainy day after the herbicide, wait until the rain stops and the field clears, and wait for about a week to check the dead grass in the field. If there is already a large area of dead weeds in the field, the herbicide is working, and there is no need to spray again. Conversely, if most of the weeds in the field are vigorous, the herbicide has been washed away by the rain, diluted the concentration and needs to be sprayed again.

When spraying herbicides again, it is recommended to buy herbicides containing safety agents, such as nicosulfuron + metrisulfone + atrazine containing safety agents, and use them according to the dosage instructions.

Summary. Hello, it rained after two hours of corn herbicide, and it will have no effect.

If it rains after two hours of corn herbicide, will it have no effect?

Hello, it rained after two hours of corn herbicide, and it will have no effect.

Because it takes 2-6 hours to absorb the old process of coarse jujube after the herbicide spraying after corn seedlings, in these 2-6 hours, the effect of rock oak is very close to the temperature and air humidity. It is also necessary to depend on the amount and duration of rainfall, that is, heavy rain, heavy rain, light rain or foggy rain, if it is light rain and foggy rain, and the time is short, the impact is not large, on the contrary, if it is heavy rain and heavy rain, and the time is long, then it is necessary to consider whether to respray. Rock liters.

Extended information corn post-emergence herbicide spraying time: spraying in the morning, noon or afternoon when the temperature is high and the weather is dry, due to the high temperature, strong light, fast volatilization of the liquid medicine, the liquid will evaporate after a while after spraying, so that the amount of herbicide into the weed body is limited, and the absorption is obviously insufficient, which affects the weeding effect; At the same time, spraying pesticides in high temperature and drought makes corn seedlings also prone to pesticide damage. The best spraying time is after six o'clock in the evening, because at this time spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the weed leaf surface for a longer time, the weeds can fully absorb the herbicide components, ensure the weeding effect, and the evening medication can also significantly improve the safety of corn seedlings, and it is not easy to cause pesticide damage.

Herbicide for corn seedlings weeding, morning and evening for a few days or a week or so has no effect, the reliable way is to understand the weather first, whether it will rain on the day of herbicide. If the weather is unstable, it's best not to fight. Isn't it time and effort to make trouble?

The above is only a suggestion, if you really encounter the situation of the subject asking questions. After the corn seedlings are treated with herbicides, they should be kept at least 6 to 8 hours without rain and weeding. Of course, the subjective factors that affect the effectiveness of weeding are related to medicinal properties, light, temperature, and moisture.

How to improve the weeding effect of corn seedlings. First,Most of the weeds in the maize seedling field are broad-leaved and sharp-leaved. The purchase of herbicides should be consistent with the properties of the weeds in the field, read the instructions carefully, and consult the salesperson who does not understand it is very helpful to improve the weeding effect.

Second,During the period of 4-6 leaves of corn seedlings, when the weeds in the ground are seedlings 2-3 leaves, spray with nicosulfuron, nicozil and deazine with an appropriate amount of water. That is to say, when the weeds are young, the weeds are effective and effective. (Note that the weeding dose should not be used in excess of the young corn seedlings).

If you can't operate against the wind when spraying in the breeze, try not to let the agent float on the corn seedlings.

In order to achieve the ideal weeding effect, it is recommended to spray glyphosate with an appropriate amount of water between the rows when the corn seedlings have 8-10 leaves and the weeds are about 9-11 cm. (It is worth noting, however, that glyphosate is a biocidal herbicide.) When spraying, the fog head should be sprayed with a protective cover and weeds from the ground at close range, and the agent cannot be sprayed on the leaves of crops.

Third,It is recommended to choose a sunny day to spray, 9-10 a.m., no dew on the weeds, around 5 p.m. The temperature is between 22 and 24, all in allHerbicide spraying and good sunlight on sunny days. The temperature is in the appropriate range, the medicinal properties are absorbed quickly, and the effect is good.

Fourth,Under normal circumstances, after 6 to 8 hours after the corn seedling herbicide, it will rain if the rainfall is not large and the time is short. It has basically no effect on the efficacy, and the drug is still effective for weeding, so there is no need to repeat the spraying twice.

If you are concerned about the effect of medicinal herbicide, it is recommended to check the weed poisoning control status after 24 hours. Like weeds, the leaves and stems are soft. Or pull up the weeds, and the color of the tips of the roots changes from white to purple-brown, which is enough to prove that the medicinal properties are not affected and effective.

In the case of heavy rain and the ground is very wet, it is completely okay to spray corn post-emergence herbicide. However, it should also be sprayed according to the specific actual situation and precautions。AvoidDue to improper operation and wrong use methods, corn seedlings suffer from pesticide damage, resulting in undue losses caused by yield reduction.

How to use post-emergence herbicides in corn.

Due to the increase in climate and ground temperature, especially after rain, weeds in corn fields also grow vigorously without the use of pre-emergence closed herbicides. The use of corn post-emergence herbicides to kill weeds in the field is a rapid, fast and effective control measure.

Corn post-emergence herbicides are used, which should be sprayed when the corn has grown to about 4 leaves. If it's rainy, that's the best. Because the soil is moist, it is conducive to the absorption of medicinal effects and can reduce the volatilization of chemical solutions.

Therefore, the effect of the drug can be doubled with half the effort. Therefore, we must not miss this favorable opportunity, only by completely killing weeds, can we promote the increase of corn production and income.

Precautions for using corn post-emergence herbicides.

Cleaning is due to the use of sprayers sprayed with insecticides to avoid pesticide damage due to compatibility with corn post-emergence herbicides.

When spraying corn seedlings herbicide, it should be sprayed between the spacing of corn seedlings and the row spacing, and on the sprinkler head of the spray pole, a protective cover is installed to prevent the liquid spray on the leaves of the corn.

3.Post-emergence herbicides and insecticides should be used separately and spaced seven days apart.

Corn field herbicide 3 4 hours after the use of rain, the effect does not affect the effect depends on the following conditions: 1. Corn herbicide components There are many corn field herbicide components, and there are systemic conductive herbicides such as: nicosulfuron, 3 4 hours after application, rain does not affect the weeding effect.

Contact herbicides such as mesotrione, 3 days after application, weeds are easy to regreen in case of rain. 2. After the use of herbicides in corn fields, 3 or 4 hours of rain, if the amount of rainfall, it is relatively small, the impact is small, and if the rainfall is relatively large, the effect is difficult to guarantee.