What should I pay attention to when the herbicide is applied in the morning or in the afternoon?

In the afternoon, when the temperature is high, the plants will transpire violently, lowering the temperature of the leaves. At this time, the stomata will open widely, and the herbicide can easily penetrate into the leaves of the plant. However, it should not be carried out at the middle of the day when the temperature is highest, because at this time, many plants will temporarily close the stomata and enter a dormant state in order to avoid excessive water loss.

Although the requirements of soil treatment agents are not as strict as those of stem and leaf treatment agents, they should be avoided when the pesticide is applied at high temperature at noon to avoid the volatilization of the pesticide after application. Both stem and leaf treatments and soil treatments should be applied in conditions where there is no wind or light winds. When applying soil treatment agents, it is required that the soil in the field should not be dry.

Herbicides, there is no best, only better, the same is to play herbs, different people will get different weeding effects even if they use the same medicine, and the method of spraying is very important. Let's talk about the best time to apply herbicides, the three principles of herbicides, and the six precautions.

First, the best time to apply herbicides.

1. Weather selection: sunny day with no wind or breeze, or cloudy day with no wind and majesty.

2. Time selection: Generally speaking, about 10 o'clock in the morning after the dew evaporates and dries and about 5 o'clock in the afternoon before the water mist is generated. It should be noted that the temperature in spring and autumn is cool, you can choose to do it at about 10 a.m. - 11 a.m. or 2 p.m. - 3 p.m., and the summer temperature is higher, you can choose to do it before 9 a.m. - 10 a.m. or after 4 p.m. - 5 p.m., winter open field crops are generally not sprayed, and crops in the greenhouse can choose sunny mornings and noons with better sunshine.

3. Weed selection: weeds in the germination stage and seedling stage (3 leaves and 1 heart) stems and leaves are relatively young and tender, and the resistance to drugs is weak.

4. Temperature selection: weeds are more active in the temperature environment of 20-30 degrees, and the herbicide effect is best at about 25 degrees.

2. Which time is better to take medicine in the morning or afternoon?

If the spraying time is too early in the morning, there will be undried dew mist on the crops and weeds, and the liquid medicine will roll down from the leaves to the soil with the dew drops or lose with the evaporation of the dewdrops, on the one hand, it will cause the loss of the liquid medicine or cause the residue of soil medicinal properties, on the other hand, with the increase of temperature, the weeds will gradually close the stomata, which will reduce the infiltration effect of the liquid medicine on the weed leaves.

In the afternoon, the spraying temperature is relatively high, and the weed plants will reduce the foliar temperature by intensifying transpiration, which will open the stomata of the leaves very large, which can make the liquid medicine better penetrate into the leaves and achieve better weeding effect. In addition, after transpiration in the morning and noon, the surface of the weed plants in the afternoon is relatively dry, which has greater water absorption requirements, which is not easy to cause the loss of the chemical solution, and can maximize the absorption of the chemical solution by the weeds.

From this point of view, the effect of spraying in the afternoon is better than that in the morning.

Hope mine is helpful to you.

Crops sown during the Spring Festival and summer, such as corn, soybeans, peanuts, etc., can be weeded in the morning and afternoon. During this period, daytime temperatures are high, especially at noon, and weather over 30 degrees is not suitable for herbicides. If the liquid evaporates too quickly, it affects the efficacy of the medicine, you can choose 7 If it is a crop sown in autumn or winter (such as wheat), the time close to noon should be chosen when weeding, and on the contrary to the above, the medicine should be prescribed between 10 and 15 o'clock.

Because the temperature is too low, the effect of the drug will also be affected, choose this time period, the temperature will rise, the weeds will be relatively absorbed, and the weeding effect is relatively good.

Depending on the actual situation, the drug** time mentioned in the above 2 points applies to individuals or growers with small plots. If you are planting a large farm or a farm, there should be a difference if you need to hire someone to take the medicine. Now the hired workers take medicine, 1,200 yuan a day, and if they only let them work for these few hours, the employer is probably not willing.

During the actual injection, some friends will react. Some herbicides (such as grasses) are more effective when there is dew than when there is no dew, so it is decided to spray them when the morning dew has not yet fallen. Friends who are interested in this can give it a try.

In the case of sunny and cloudy days, this is analyzed on a scale of 1 and 2. In summer, when the temperature is high, sunny or cloudy, it is best to avoid noon. Because the temperature is high, it will evaporate.

If it is a winter herbicide, it is best to apply the agent in clear weather.

Herbicides can be divided into pre-emergence herbicides, post-emergence herbicides, long-term herbicides, soil sealing herbicides and other herbicide varieties, generally spraying herbicides to improve the safety of crops. It is usually decided to spray herbicides during the day. The quality of the herbicide effect is related to whether the concentration of the herbicide is appropriate, whether the temperature reaches the best temperature of the herbicide, according to the different crops planted, the general herbicide temperature should be at least 6 degrees or more, in order to play a better weeding effect.

For example, spraying herbicides in wheat fields can be divided into spraying before the year and spraying after the year, using herbicides for winter wheat, preferably spraying sand after 10,336,000 in the morning and before :00 in the afternoon. In other words, the sun's light is used to raise the temperature during the day and improve the weeding effect.

The planted garlic is weeded in the field, and the garlic is suitable for planting around the National Day. At this time, the outside temperature is basically stable at about 20 degrees, and the soil sealing herbicide should be sprayed after the garlic planting is completed. At this time, in the morning, afternoon, and throughout the day, if the soil is suitable, you can spray the soil sealing herbicide.

Cover with mulch film immediately after spraying to moisturize and improve the sealing effect of the sealing herbicide.

First of all, the difference between "morning shot" and "afternoon hit", in fact, this is just a general statement, what really determines the efficacy of the drug is actually the temperature, the herbicide wants to give full play to the effect, the temperature should be above 10. Theoretically, the higher the temperature, the better the efficacy; However, too high a temperature will also cause the herbicide to evaporate too quickly, and the efficacy will also be reduced, so the optimal spraying temperature should be between 10 and 24. Generally, the time to spray herbicides is in summer, and it is easy to reach more than 10, so it can be said that the morning and afternoon spraying can play a good role.

However, it should be noted that the summer temperature is high, and the temperature can reach about 20 to 30 degrees Celsius after 10:30 a.m. and until 4 p.m.

Herbicides must be selected when the weather is good to play the effect is good, farmers know that the higher the temperature, the easier it is to play the herbicide grass, on the contrary, the herbicide can not play its role, for some grasses with more tenacious vitality is in vain. It is best to apply herbicides in spring near noon, because the temperature is low in the morning and evening in spring, and the effect will be better between 11 and 3 o'clock. Under strong sunshine conditions, the temperature increases, the herbicide activity is enhanced, and the herbicide efficacy is improved. When the sunlight is weak, the herbicide sprayed on the weeds conducts very weakly, and even cannot be conducted if there is a lack of light.

Is the herbicide applied in the morning or afternoon? Many old farmers are wrong, no wonder it doesn't work.

The best time for pre-seedling herbicide spraying is just after sowing, because the surface of the land is moist just after sowing, herbicides can play a good effect, and it is best to spray on a windless day, but there is wind when planting in spring, you can lower a little spray faucet time to choose: generally speaking, about 10 o'clock in the morning after the dew evaporates and dries and about 5 o'clock in the afternoon before the water mist is generated. It should be noted that the temperature is cool in spring and autumn, so you can choose to do it around 10-11 am or 2-3 pm.

<> the effect of herbicides has a lot to do with temperature, playing in the morning or in the afternoon is actually to choose a relatively suitable temperature to apply pesticides, so as to make the herbicide achieve the best effect, it is related to the crops planted, the following is an example of field crops. Sunny weather. Generally speaking, in the sunny weather in summer, we use herbicides for weeding with a higher probability, at this time because of the summer scorching sun, the temperature is relatively high, it is recommended that you choose to spray at about four or five o'clock in the afternoon,.

The best effect of spraying herbicide is that the surface of the weed blade is evenly moistened, and the agent can be fully absorbed by the weeds. If there is dew on the crop leaves or pressed grass leaves, the dew on the upper crop leaves falls with the droplet pressure of the sprayer, and the herbicide is played in the weather with low temperature, and the herbicide will be played slowly when the temperature reaches more than 10 degrees Celsius, so that the herbicide can be fully exerted, so the herbicide should be sprayed when the temperature is high on a sunny day, winter and spring.

Huaihai area is generally a season of rice, and rice is in the summer high temperature area, then to avoid the hot and high temperature, 8 to 10 o'clock in the morning is better, 16 o'clock to 19 o'clock in the afternoon is appropriate. Especially corn weeding, if the soil drought is severe, the targeting of herbicides is relatively strong. There are many weeds and a complete variety of herbicides, and the purpose of applying it is to eliminate weeds, which is generally applied by spraying method, either on the surface of the soil layer or on the grass stems and leaves.

It is better to play in the morning, because the temperature will not be very high in the morning, and it will be more comfortable to go out to work at this time.

It is better to shoot in the afternoon, because the sun is abundant in the afternoon, and after applying herbicides in the afternoon, the grass will be killed and will not allow the grass to survive.

It is better to shoot in the afternoon, because there will be plenty of sunlight in the afternoon, and the herbicide can also have a good effect at this time, and it will not be quickly dissipated in the process.

It's better to play in the morning. Because the sun is more abundant in the morning. You can be more careful when applying herbicides.

I think it should be done in the afternoon, because there may be dew in the morning, if there is a leak, the pesticide will be mixed into the water and fall, there is not much effect, so it should be done in the afternoon.

It should be played in the afternoon, because at this time the sun is not so abundant, if it is after the morning hit, because of the dew and sunlight they will still grow.

It should be better to play in the afternoon, because the temperature in the afternoon is relatively high, and it will not harm other plants, and the effect is also better.

Herbicides generally have a better effect when weeds are in the 2-3 leaf stage, and the factors that will affect the weeding effect are temperature, air humidity, soil nutrients, light, etc.

In general, the most suitable time for herbicide spraying is before 10 a.m. or after 4 p.m. on a sunny day, and all day on a cloudy day (when it does not rain), which can give full play to the effect of the herbicide. If there is dew on the weeds in the morning, try not to spray the herbicide, because the agent will be diluted by the dew, so that the desired effect will not be achieved, and the agent may slide to the ground with the dew, and will not have any effect on the weeds.

Herbicide influencing factors.

1. Choose the right herbicide, because each herbicide has a certain herbicidal spectrum, which is incidising and selective. Therefore, it is necessary to choose effective herbicides according to the types of crops and the main varieties of weeds.

2. Select the best period for application according to the nature of the herbicide, the period of weeds, the growth period of weeds and crops, and select the appropriate period for use. There are many varieties of herbicides, including stem and leaf treatment agents, soil treatment agents, contact herbicides, biocidal herbicides, etc., some are suitable for pre-bud weeding, and some are suitable for stem and leaf weeding.

3.The effect of herbicide is directly proportional to the temperature. When the temperature is high, the function of weeds in absorbing and transporting herbicides is strong, and the herbicide activity is also high, which is easy to give full play to the herbicidal effect in the action site of weeds.

Is the herbicide applied in the morning or in the afternoon? In fact, there is no fixed statement, these two time periods can be considered, but for different people, there are still quite a few differences in the efficacy. Therefore, choosing the right time to weed can also be twice the result with half the effort.

The following is a brief introduction to the timing of herbicide spraying.

Spring spraying

Time should still be selected according to the season, for example, in spring and autumn weeding, it is dark early in the afternoon and the weather temperature is low, in this case, it is best to choose to spray herbicides at about 10 o'clock in the morning, at this time the dew in the field is basically gone, and it is also conducive to the absorption and utilization of herbicides after herbicide spraying.

Summer spraying

In summer, the temperature is higher, and the morning is relatively early, basically the dew is basically dry at 9 o'clock in the morning, and the dew gradually starts at 7 o'clock in the afternoon, so it can be said that spraying herbicides at 9 o'clock in the morning and four or five o'clock in the afternoon are good choices. From the perspective of safety, it is basically very hot at 9 o'clock in the morning in summer, and the transpiration effect is relatively large, so if the safety of the herbicide itself cannot be fully guaranteed, it is more recommended to spray in the afternoon.

Temperature factor

The temperature also has a great impact on the efficacy of herbicides, and the temperature also directly determines the time selection of spraying. In summer, the temperature is generally high, and the transpiration effect is relatively large, so in order to avoid water loss, crops will exert their physiological regulation ability, and will close the stomata. In this way, after spraying herbicides, it is difficult for the drug to enter the plant to exert its effect.

For example, if you spray in the morning, the temperature will gradually rise, and the temperature like this will reach more than 30 degrees Celsius by 11 a.m., and the stomata will be closed when the slope is exposed to high temperatures.

There is no such problem in the afternoon spraying, the temperature will gradually drop after four o'clock in the afternoon, the stomata will gradually open, after spraying herbicides, the drug is relatively easy to penetrate into the plant tissue, and the metabolic effect of the plant at this time is also relatively strong, and the effect of the drug is quickly exerted.

In addition to the factors mentioned above, if a little urea is added to the herbicide spray or if the field is fertilized before the herbicide is sprayed, the herbicide spray will also be more effective after spraying. In the problem of herbicide application, there is no best, only better, and mastering the appropriate application time and method will make you get twice the result with half the effort.