When is it good to apply herbicides to wheat, and how many days is suitable for wheat planting

Wheat field agents are used in two peak periods, one is from mid-November to the end of December before the year. The second is from the end of February to the end of March after the new year. However, wheat field herbicides are still the best before winter, grass age is small and easy to eliminate, after the application of pesticides, one is that the grass is difficult to remove, the other is the amount of medicine, the effect can not reach the effect of the previous use, and it is easy to cause herbicide residues, so it is recommended to use the herbicide before the year, and the wheat field herbicide can be used at a temperature of 8-10 degrees.

Wheat weeds have always had a great impact on the growth of wheat, and it is difficult to remove weeds in wheat fields and grow fast, so spraying herbicides must be selected at the right time. Let me introduce it to you.

Wheat herbicide application time: the application period is the early stage of wheat tillering before winter and wheat jointing in the second year. The effect of drug control at these two times is better, and it is relatively safe for wheat, and the effect is poor if it is late, among them, the earlier the 2,4-d butyl ester is used, and besulfuron is used before getting up after the wheat returns to green, so as not to cause pesticide damage to the next crop.

To apply herbicides to wheat, it is necessary not only to master the time, but also to master the temperature and humidity when using herbicides: the average temperature when using herbicides should be above 6, which will achieve very good control results. For example, besulfuron is sensitive to temperature, and the prevention and control effect can only be shown after 15-20 days or even 30 days after the drug under low temperature conditions.

In addition, herbicides should be used on sunny days and slightly higher temperatures, generally from 10 a.m. to 3 p.m. In case of dry soil, herbicide application should be increased to ensure the control effect.

Soil moisture should also be well grasped: seize the opportunity of watering wheat field, apply pesticides in time to ensure the effectiveness of herbicides, most herbicides need a certain amount of soil moisture, and soil moisture is conducive to the play of herbicide efficacy when it is 40%-60%. The drought is severe, most wheat fields are dry, and herbicides should be used in a timely manner when used at this time in combination with the favorable timing after watering (or after rainfall).

Precautions for spraying herbicides in wheat:

The spraying time must be mastered before the wheat returns to green to jointing, the average daily temperature is stable at more than 10 degrees, and chemical herbicides shall not be used after wheat jointing to prevent pesticide damage.

Pay attention to weather changes before application, and when there is a strong cooling within 2 to 4 days before application, it is not suitable to use medicine.

Strictly grasp the dosage of medicine, can not increase or decrease at will, for some new herbicide varieties, must not be used blindly.

When spraying, it should be uniform and thoughtful, so that there is no leakage and no respraying.

Choose the right type of herbicide based on the weed species in the field.

After reading the above introduction, do you know when to spray herbicides, for the high yield and harvest of wheat, we must do a good job of weeding in wheat fields in time.

After the wheat three leaves and one heart, the weeds are all out, the average daily temperature from November 25 to December 15 is not lower than 5 degrees, and there is no special weather before and after a few days, or spraying before the spring joint.

Wheat herbicides.

Hello! Wheat field grasses can choose alkynyl ester, fluzosulfuron, sulfazulam, zolinoline, methyldisulfuron! Broad-leaved weeds can be controlled with diflusulfam, zolazone, chlorofluoropyroacetic acid, benzsulfuron, and sodium dimethyltetrachloride.

Wheat can generally be treated with herbicides 40 days after sowing. At this time, the wheat is in the 4-leaf or 4-leaf 1-heart stage, and it is more tolerant to herbicides, so it is safer to apply herbicides at this time. In addition, when the wheat is 4 leaves, most of the weeds have come out, and the grass age is small, the wheat has no tillering, and there are not many leaves, so it is easier to kill weeds with herbicides, and the efficiency will be higher.

1. The time of the first use of wheat is 40 days after sowing, when wheat is in the 4-leaf or 4-leaf 1-heart stage, which is more tolerant to herbicides, and it is safer to apply herbicides after 4 leaves; Moreover, when the wheat is in the 4-leaf stage, most of the weeds have come out, the grass age is relatively small, the wheat has no tillering, and the leaves are not many, so it is easier to kill the weeds, and the herbicide is very efficient at this time. 2. Generally, the herbicide will be marked with 2 can be used, or 5 can be used, then the 2 and 5 mentioned here refer to the minimum temperature, that is, the minimum temperature can only be used for control with herbicides above 2, and before and after 2 days after the herbicide, it should not be lower than this temperature.

Hello, happy to be able to answer this question for you. Generally, herbicides are played in 2 periods (before and after the year), that is, wheat seedling stage and wheat regreening period 2 time periods, wheat seedling period in most areas is about late November, wheat regreening period is between late February and early March, these two time periods are the best period for wheat herbicide spraying, the control effect is better at this time, but for some areas that are sown too late, it is necessary to determine according to the specific growth of local wheat. Hope it helps.

The best time for wheat herbicide effect is generally 2 periods, the year before and just after the year, that is, the two time periods of wheat seedling stage and wheat rejuvenation stage.

According to previous years, the wheat seedling period in most 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, according to the specific growth of local wheat.)

The temperature of winter wheat herbicide should not be too low, generally to ensure that the temperature during the day is above 6 degrees, if it is better. In terms of humidity, if the drought affects the weeding effect, the soil moisture is generally 40%-60% when it is most conducive to the exertion of the effect. At the same time, I would like to remind everyone that winter wheat herbicides are generally chosen after 10 a.m. and before 16 p.m.

Now many places are below 0 degrees, there is no need to spray pesticides at this time, you can come to the end of the New Year after the temperature rises and then carry out weeding, the general temperature is higher than 10 degrees, the weather is sunny, after 10 o'clock in the morning to 3 o'clock in the afternoon before the application, in order to ensure the effect and reduce the damage of pesticides.

What are the precautions when playing wheat herbicides:

When applying pesticides, it is necessary to pay attention to the weather conditions of the days before and after, and if there is continuous cooling weather, it is not suitable to use drugs. The dosage of wheat herbicide must be strictly in accordance with the standard amount, otherwise it will cause damage to the pesticide if it is too much, and the grass will not die if it is less. When spraying, it should be even, and it should not be resprayed or omitted.

The wheat herbicide application period is: wheat seedling stage (mid to late November), and regreening period (late February to early March), the temperature is above 10 degrees, the average daily temperature is not less than 5 degrees, wheat herbicide spraying time has two stages, one is the wheat seedling stage before the year, the other is the regreening period after the year, and the benefits of choosing the previous year are as follows:

1. The weeds were small before the year, and the wheat seedling slippery chain mountain was basically not closed, so that the weeds were increased in the area of medicine, and the weed resistance was also poor before the year, so the weeding effect was ideal.

2. Compared with the year after the year, there is less medication, for example, a set of one acre of land before the year can only score about 7 points after the year, which saves costs.

3. Malignant common weeds in wheat fields, such as pig disaster, wheat lady, oats, finch wheat, etc., under the same conditions, the control effect before the year is better than that after the year.

Wheat herbicides are best applied in the period from mid-November to early December.

Wheat herbicides should be sprayed at the first stage of growth, mainly at the seedling stage and the regreening stage, and at the jointing stage, it is likely to affect the growth of wheat because of entering the panicle differentiation stage.

Wheat field weeding generally has a better effect when the temperature is higher, not only the absorption effect is good, but also not easy to appear pesticide damage, when the average temperature in winter is low at 10 degrees, it is easy to affect the effect of wheat herbicide, if it is lower than 5 degrees, the probability of pesticide damage may be greater.

If the temperature is too low in winter, you can carry out weeding after the annual temperature, the temperature is generally higher than 10 degrees, the weather is sunny, and the pesticide is applied before 10 o'clock in the morning and 3 o'clock in the afternoon, so as to ensure the effect and reduce the damage of the pesticide.

Selection of wheat herbicide species

Do not use herbicides such as methyldisulfuron-methyl and xoxazole that are prone to pesticide damage when cooling down, and methyldisulfuron-methyl should not be used after jointing in wheat fields.

Diflusulfam, dimethyltetrachloride sodium can also be used for the control and sowing of Artemisia annua, camellia and quinoa, and methyldisulfuron-methyl or fluazosulfuron can be used for monocots.

When using herbicides, it is necessary to follow the instructions, and it is recommended to dilute them twice, and pay attention to the concentration ratio when mixing with other pesticides or foliar fertilizers.