What are the key points to pay attention to when spraying herbicides on wheat?

Most of the herbicides in wheat fields are medicines after the four leaves, and they are not used when it comes to weeding. Before the four-leaf wheat is relatively fragile, with low detoxification and immunity, it is easy to cause weakness. After the promotion period, the wheat enters the pregnancy panicle stage, which is also the most vulnerable and important period in life.

At this time, it is easy to weaken with herbicides. In particular, 2-methyl4-chloro, 2,4-suitable ester can sometimes cause non-pulling or deformity of wheat ears, which seriously affects the final yield.

We all know that it takes a 7-day gap to apply organophosphate or carbamate pesticides in corn fields. Wheat fields need at least 3-5 day gaps before herbicides can be used. Otherwise, it is easy to cause the phenomenon of wheat turning yellow.

Organophosphorus pesticides reduce the ability of wheat to separate herbicides, so the use of herbicides tends to cause weakness. Except for individual herbicides (diflusulfonamide, low temperature tolerance), general herbicides do not work well at low temperatures, and it is best to take the drug at an average temperature of more than 8 degrees per day. The higher the temperature, the better the weeding effect.

Weeds can absorb light and grow well, so the pores are open, and it is easy to absorb water and chemicals (vice versa if the temperature is low), so it can achieve a good weeding effect.

In addition to looking at the temperature, herbicides also need to grasp the moisture of the soil. When the drought is severe, it is necessary to seize the time to water the wheat field and administer the herbicide in time to bring out the efficacy of the herbicide. A certain amount of soil moisture is required to exert the efficacy of most herbicides, and soil moisture at 40% to 60% is the most conducive to the exertion of herbicide efficacy.

Before the four-leaf wheat is relatively fragile, with low detoxification and immunity, it is easy to cause weakness. After the promotion period, the wheat enters the gestational panicle stage, which is also the most fragile and important period in life, and it is easy to weaken when using herbicides. Except for the chloropyroxyacetic acid herbicide, which can be reduced by half after pulling, it is best not to try other herbicides!

Herbicides are used above the average daily temperature of 8 and are easy to exert their effects, and they are easy to weaken when the temperature is too low. It should be noted that the average temperature is higher than 8 for several days in a row. It's not just the temperature on the day of spraying.

The timing of spraying herbicides and some fungicides or insecticides is also different. Usually we prefer to apply herbicides after 10 a.m. and before 4 p.m. on a sunny day. Generally, the winter wheat field sends the straw back to the field, and the plot is loose.

In years with unusual weather, such as warm winters and droughts, the roots of wheat may be too loose to penetrate or partially exposed. This wheat is prone to frostbite and lack of water, and is sensitive and fragile, so herbicides can cause some damage to the wheat.

We all know that corn fields have been sprayed with organophosphorus or carbamate pesticides need to be separated by 7 days before herbicides can be used, and wheat fields have been sprayed with such pesticides at least need to be separated by at least 3-5 days before using herbicides, otherwise it is easy to cause wheat yellowing and leaf burning, because organophosphorus pesticides reduce the ability of wheat to reduce herbicides, and then the use of herbicides is easy to lead to pesticide damage.

Wheat fields have been sprayed with organophosphorus or carbamate and other such pesticides also need to be at least 3-5 days apart before using herbicides, otherwise it is easy to cause wheat yellowing and leaf burning.

Wheat weeding generally has two periods, one before winter, one after spring, when spraying herbicides, we must pay attention to the daily average temperature of more than 8 use, easy to exert the efficacy, when the temperature is too low, it is easy to appear pesticide damage. Note that the average temperature is above 8 for several days in a row, not just on the day of spraying! It is best to do it after 10 a.m. on a sunny day and before 4 p.m.

When choosing herbicides and quietly transporting rocks, you should choose some milder herbicides in advance, and pay attention to ensuring that all roots and orange weeds can be contacted when spraying.

First of all, we should choose a good quality herbicide, and we should also choose a herbicide that has less damage to the buried ground and crops, and then spray it on the weeds regularly.

Be sure to pay attention to the concentration of herbicides, be sure to pay attention to the spraying range of herbicides, pay attention to the spraying time, and choose the right agent.

When spraying wheat herbicides, the secondary dilution method of the liquid medicine must be used, and the liquid medicine or the liquid medicine should not be mixed with water, and the dosage and concentration of the drug should not be increased without permission. For the treatment of wheat stems and leaves after seedlings, they are basically selective agents. Therefore, after the normal spraying of some pesticides in production, because of the influence of wheat itself on the decomposition ability of pesticides, or after spraying encountering adverse environmental conditions such as low temperature, different herbicides show different symptoms, and the prevention and control measures are also different, under normal circumstances, the use of grasses weeds herbicides is too large to cause wheat seedlings to turn yellow, leaf tips to dry up and other phenomena, while the main symptoms of broad-leaved weed herbicides are yellow leaves.

<> For woodland nurseries that did not use herbicides last year, to use herbicides, the hay in the field should be cleared before the herbicide is used. Due to the use of manual weeding or the use of substandard herbicides at that time, the weeding effect was poor, resulting in overgrown weeds, and the wheat was yellowed with herbicides, which was undoubtedly caused by pesticide damage. Once this happens, it is necessary to take immediate measures, and there must be no delay in time, so as not to miss the best remedial period, resulting in a reduction in wheat yield, or even a dead harvest, and increasing unnecessary damage For the woodland nurseries that did not use herbicides last year, herbicides should be used, and the hay in the field should be cleared before using herbicides.

Spray pesticide reliever to reduce pesticide toxicity. You can use Bihu in time, add potassium dihydrogen phosphate and add a small amount of urea with water, mix and spray, spray 1-2 times in a row, once every 7 days, the effect is very good, you can also choose brassinin or sodium nitratel and so on plus alginic acid or amino wheat after the spray wheat seedlings yellow, may be caused by too much herbicide, it is recommended to spray brassin again when the water pole, brassinin can alleviate the damage, a bucket of water with 6 grams of water agent brassinolide. Generally speaking, the acute pesticide damage will be a variety of irregular spots, perforations, wilting, yellowing of branches and leaves, and various complications such as leaf drop.

The leaves of wheat are in an unhealthy state such as deformity and distortion during the growth process. Wheat heading is distorted and deformed. Farmers learn more about pesticides and take the right way to control weeds.

Herbicides will cause wheat leaves to turn green, leaf herbicide spraying will cause land drought, not conducive to the growth of wheat, after wheat spraying herbicides, generally old farmers will irrigate and detoxify, or apply lime to neutralize acidic herbicides.

1. Before winter, when the chemical weeding application time is about 4 to 5 days after wheat sowing, after the wheat is in the 3-leaf stage, when the weeds are basically complete and the tissue is delicate, the control effect is generally better from mid to late November to early December.

2. After the Spring Festival to the wheat before the festival, the herbicide must be sprayed, and the herbicide can not be used after the festival, some drugs will cause pesticide damage to wheat, causing wheat deformation, bending, empty trees and other symptoms, affecting wheat yield.

After the Spring Festival, broad grass and grass are all out of order, and the grass is old, there are many wheat leaves, and the amount of medicine and water is appropriately added to kill the weeds when applying pesticides before the year.

3. Timely spraying: choose a sunny sky, no wind and no rain, and the average temperature is about 10 degrees; Apply pesticides when soil and wheat seedlings are in good moisture; When the moisture is not good, when there is no rain, the pesticide can be applied after 3 to 5 days after watering; After heavy rain, the interval is about 1-2 days to apply, and the pesticide can be applied at any time after the light rain and no rain, so as to ensure that there is no rain for 8 or 12 hours after the application. If the temperature is lower than 6 degrees Celsius and the soil is dry, it will affect the effect of the herbicide.

It is necessary to pay attention to the amount of herbicide used, pay attention to the conditions of weeding, pay attention to the growth of wheat, understand the disease phenomenon of wheat, pay attention to the use of herbicides, and pay attention to the effect of dilution.

First of all, the temperature must be strictly controlled, secondly, it is forbidden to use drugs in bad weather, and then, when using herbicides, you must pay attention to secondary dilution, etc.

Be sure to pay attention to the concentration of herbicides, do not let the concentration be too high, do not cause pesticide damage, and choose safe agents.

Start with a timely detox. If the herbicide spraying dose is too large, it is necessary to spray water in time to remove leaf residues, reduce the herbicide content in wheat, and avoid soil drought at the same time. In addition to the effect of herbicide residues on crops in the previous season caused by wheat pesticide damage, when spraying herbicides in wheat in the field, if the pesticides are not properly selected, or the quality of the pesticides is not good, or the spraying period is not suitable, or the application dose is too large, or the pesticides are resprayed, or the mixed pesticides are improper, or the application equipment is improperly selected, if the herbicide damage of wheat before winter, brassinolide, treasure leaves, naphthalene acetic acid, potassium dihydrogen phosphate, gibberellin garlic, DA-6, and vitrin can be sprayed immediately to alleviate the damage; If it is a pesticide damage during the jointing stage of wheat regreening after the year, it can be remedied by spraying amino acids, treasure leaves, and potassium dihydrogen phosphate.

<>1.If you find that the wrong herbicide is used in time, or the concentration is too large, spray more water immediately to dilute it, which may be effective. 2.

After dilution with water, foliar fertilizer can be sprayed. Pyridine herbicides, we also use more in the production process, and they are more toxic to humans. It is generally used in orchards, mulberry orchards, tea plantations, etc., such as paraquat, which we used in the past, to be treated with herbicides.

Timely watering, if it is found that the leaf tip of the wheat is dry after the use of herbicides, the leaves are yellow and wilting, whitish and other phenomena, irrigation measures should be taken immediately, so that the effect of diluting the pesticide residue and reducing the soil content can effectively reduce the harm of pesticide residues to wheat. In addition, some growth regulators sold on the market are said to be able to cure the harm, how to say this, you can try it, according to the dosage they say, if it can save the best, if it can't be saved, then there is no trick, this depends on the individual.

It is necessary to rinse quickly and repeatedly with clean water, so that the concentration of pesticides can be absorbed, and for alkaline replication and decomposition of herbicides, quicklime can be used for spraying.

Farmers should dilute the herbicide with water and make the herbicide a little lower before spraying, which can reduce the damage.

It is necessary to detoxify immediately, and also spray water to reduce the content of herbicides, and also to replenish the soil with some water.

Farmers should reduce herbicides and pull weeds by hand, which is good for wheat and can also get high yields, which is very good.

The best thing to do is to buy a wheat-specific herbicide that will not cause damage to the wheat.

Wheat herbicide spraying time is an indispensable item in wheat planting, wheat weeding, need to pay attention to ways and means, reasonable time will be able to inhibit weeds. So, when is the time to spray herbicides on wheat? What should be paid attention to when applying herbicides for winter wheat?

When to hit wheat herbicides:

Generally, there are 2 periods, the year before and just after the year, in detail, it is: wheat seedling stage and wheat rejuvenation period 2 time periods.

According to previous years, the wheat seedling stage in most of the deficit areas is around late November.

The regreening period of wheat is between late February and early March.

These two time periods are the best time for wheat herbicide spraying, and the control effect is better (sowing too late in some areas, depending on the specific growth of local wheat.) ）。

Time and precautions for wheat herbicide:

1. Do not use herbicides before and after jointing of wheat 4 leaves.

Before the 4-leaf stage, wheat is relatively delicate, with low detoxification ability and easy to produce pesticide damage. After the jointing period, the wheat enters the booting stage, which is very fragile, and at this time the herbicide is very easy to produce pesticide damage, especially dimethyltetrachloride, which sometimes causes the wheat ear to be unpumped, or deformed, which seriously affects the final yield.

Second, the temperature is lower than 6, do not use wheat herbicides.

Herbicides in low temperature weather, the effect is not ideal, try to use the herbicide on the daily average temperature of 6 to the bush, 10 am to 3 pm about the weeding effect is good. Because weeds absorb light and grow vigorously, the stomata are open, and it is easy to absorb water and liquid medicine (the opposite is true for low temperatures), which can achieve a good weeding effect.

3. Do not use wheat herbicides when the soil is dry.

When the soil is relatively dry, it is necessary to seize the opportunity of watering the wheat field and apply pesticides in time to ensure the effectiveness of herbicides.

Most herbicides require a certain amount of soil moisture to exert their efficacy, and soil moisture is conducive to the exertion of herbicide efficacy at 40% to 60%.