Can you apply corn post emergence herbicide at noon when the temperature is 27?

Yes, it is best to spray the herbicide after the corn seedlings after 6 p.m.

Because of this spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the leaf surface of the weeds 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.

Post-emergence weeding is a more traditional method of weeding, which refers to spraying herbicides to weed corn after corn emerges. The spraying time is in the 2 5 leaf stage of corn, at this time corn resistance is high, not easy to appear pesticide damage. If it exceeds this period, the height of the nozzle should be reduced when spraying, so as to avoid pesticide damage caused by pesticide filling.

Precautions for using herbicides on corn

Under normal circumstances, when corn is weeded after emergence (corn seedlings are sprayed), when the corn seedlings grow to the 3-5 leaf stage or about 15 days after the corn is sown, this is the best time to spray herbicides in the corn field.

When applying herbicides in corn fields, it is necessary to look at the seedling age of corn seedlings, mainly to avoid pesticide damage to corn seedlings after spraying and to improve the weeding effect after spraying. This is because corn seedlings have the strongest resistance at the 3-5 leaf stage, and at this time, weeds are basically in the young stage when they have just broken the soil and emerged from the seedlings (poor resistance and easy to kill).

Therefore, spraying at this time can not only prevent the occurrence of herbicide damage to corn to the greatest extent, but also greatly improve the effect of herbicides in killing weeds.

Since it takes 2-6 hours of absorption after post-emergence herbicide spraying in corn, in these 2-6 hours, whether the effect of the herbicide is good or not (that is, whether the weeding effect is ideal) is 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 amount is obviously insufficient, thus affecting 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.

Corn post-emergence herbicides are best at the 3-5 leaf stage of corn and 2-4 leaf stage of weeds.

In order to improve the weeding effect of herbicides and the safety of corn, it is recommended that farmers use herbicides before 10 o'clock in the morning and after 5 o'clock in the afternoon, spraying pesticides in the morning, noon or afternoon when the temperature is high and the weather is dry.

In addition, it takes 3-6 hours for the herbicide to completely absorb the solution, so there is no need to spray it in case of rain within 24 hours.

Weeding Note:

1. Weeding should be done as soon as possible.

Weeding at the seedling stage of corn should be done as soon as possible, and the weeds can be applied once before they are unearthed, which can effectively control the weed damage during the whole growth period. Soil closure is carried out before corn seedlings, which has good weeding effect and high safety. If no measures are taken before the weeds are unearthed due to weather or other reasons, correct control can be carried out when the weeds are 3 5 leaves and 2 4 leaves after the corn seedlings, which can effectively control the growth of weeds.

2. Herbicides should be appropriate.

Herbicides after corn emergence mainly include atrazine, nicosulfuron, oxamidone nitrate, etc., weeding must be sprayed according to the instructions, not too much, to avoid pesticide damage, weeds are not unearthed generally with 150 200 grams per mu for prevention.

After seedlings, it is generally used to mix 4% atrazine and 20% nicosulfuron, or add 2% 3% mesotrione on this basis, 80 150 grams per mu, mixed with 30 kg of water to spray stems and leaves. Herbicides are generally diluted twice to avoid pesticide damage caused by uneven concentration.

3. Control soil moisture and temperature.

Appropriate soil temperature and humidity is the key to ensure the efficacy of the drug, and the dosage should be increased when the weather is dry; When the soil is wet after rain, the dosage can be reduced or the normal dosage can be used, and the sprayed pesticide is easy to form a film on the soil surface, and the weeds and the pesticide can be killed by contact. If the soil temperature is low, the dosage of the agent can also be increased to avoid the effect is not obvious.

First of all, watering immediately after the herbicide is definitely not good, the liquid is diluted, can not achieve the effect of weeding, followed by the temperature, weather, spring and summer herbicides, the temperature has been a matter, under normal circumstances, 8 hours after you can water, such as the corn herbicide now, if it is a winter herbicide, due to the low temperature, the effect of the drug is slow, it needs to be appropriately extended, must be played before the wheat herbicide, need to be separated by about 3 days, let the effect of the drug, and then watering.

1. Water when sowing.

After sowing corn, if the soil moisture content is relatively high at the time of sowing, you can do without watering. If the soil is dry, then it is necessary to water, generally soil moisture is 65-75% of the water holding capacity in the field, which can promote the germination of corn seedlings, improve the germination rate, and prevent ridge breakage.

2. Watering during jointing.

Corn seedlings enter the jointing stage after the plant begins to grow rapidly, at this time the water demand increases, the general soil moisture is 60-65% of the field water holding capacity, if the soil water content is relatively low, it must be watered, the jointing period watering is particularly important, because it will not only affect the growth of corn plants, but also affect the heading and flower bud differentiation of corn.

3. Watering at the heading stage.

After the corn plant enters the heading period, not only the temperature will be very high at this time, but the leaf area is also the largest, so the corn in the heading period is the time when the corn needs the most water during the whole growth period, and the general soil moisture is 70-80% of the water holding capacity in the field, so the water content of the soil should be watered in time at this time. Watering at the heading stage can not only improve the photosynthesis products of leaves, but also help to improve the pollination rate of maize, and lay the foundation for early grain filling of maize in the later stage.

4. Watering during the grouting period.

After the corn enters the grain filling stage, the water requirement is still relatively large, and the general soil moisture is 70-75% of the water holding capacity in the field, and sufficient water can better make the corn grain filling, thereby improving the yield. Therefore, after the corn enters the filling stage, if the soil moisture is lacking, it should be watered as soon as possible.

After spraying herbicide, it generally takes more than 4 hours for the components of the medicine to be absorbed by weeds, so there is no problem in watering the corn field after spraying herbicide.

Summary. Hello, dear, can be played in the morning.

Hello, dear, can be played in the morning.

Herbicide spraying is generally done before 10 a.m. and after 5 p.m. However, in the morning, make sure that there is no dew and then play a group to sing, there is dew will affect the effect of the medicine.

One of the most significant characteristics of summer is the high temperature, the high defeat is not conducive to the liquid medicine to stay on the surface of the weeds, and even sometimes the sprayer nozzle sweeps the weeds after the weeds are not even traced, and the liquid volatilization is too fast is not conducive to the herbicide being absorbed by the weeds and the weeding effect is volatilized.

Although high temperature helps to improve the absorption and delivery capacity of weeds to herbicides, and promotes the inhibition and eradication of weeds, it is not good for the liquid medicine to evaporate too quickly. Therefore, in summer, herbicide spraying should be carried out before 10 p.m. for upper limb swimming, or after 5 p.m. for those who guess the herbicide.

Corn can be sprayed with some drugs at the three-to-five-leaf stage When the corn grows five leaves, it can produce a substance that can detoxify, and this substance can eliminate the damage caused by some herbicides, so it is very good to use herbicides when the corn is in the three-to-five-leaf stage, andWhen the corn grows five leaves, some weeds in the ground are still very small, and the effect of herbicides is also very good at this time, and there are many suitable types of herbicides.

When the corn seedlings first germinate, it is best not to play herbicides, because the initial corn seedlings are not bad drugs, and if the herbicides are used, it is very easy to poison the corn seedlings, so the herbicides must be considered more carefully. Some growers choose to use physical weeding by using some tools to hoe or pull out some grass, but this is a very labor-intensive method, so herbicide is also a better choice.

It is best to spray 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.

Corn insecticides are best applied about 7 days after the herbicide, that is, after the 3-5 leaf stage of corn, mainly to control corn armyworm and borerworm.

I think it should be best to apply herbicide to corn seedlings when they have 3 to 5 leaves.

When the corn seedlings grow to more than ten centimeters, or when they have just entered early summer, the effect of spraying is best in these two periods.

Post-emergence herbicides can generally be applied when corn enters the 3-5 leaf stage. When spraying, the temperature is required to be 15-25, the humidity is required to be above 65%, and the wind speed is required to be below 4 meters per second.

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. A few leaves of corn seedlings can be sprayed with corn post-emergence herbicide, corn 3-5 leaves, weeds 2-4 leaf stage is the best, especially the mixture of Yu Nongle and 2,4-d butyl ester can not be applied after the 5-leaf stage of corn. The weeds in the field are basically complete, and most of the weeds are sprayed at the 2 4 leaf stage.

If the application period is too late, the weed resistance will be enhanced, and the weeding effect will be affected. When spraying, the temperature is required to be 15 25, the relative humidity of the air is more than 65%, and the wind speed is less than 4 meters per second. Select the spraying equipment and nozzle as required, and apply the spray according to the operation specifications.