What are the requirements for the time and temperature of wheat weeding?

Generally, it is advisable to be above 10°C, and the minimum temperature should not be lower than 5°C. Wheat is a plant belonging to the order Poaceae, Poaceae, Wheat family, Wheat genus, common wheat species, it is distributed all over the world, its fruit can not only be used to make bread, steamed bread and other foods, after fermentation can also be used to make beer, alcohol, liquor and biomass fuel.

The period between late February and early March is the best period for wheat herbicide spraying, and the control effect is better. 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 the humidity is particularly dry, it will affect the weeding effect, and the general soil moisture is 40%-60% when it is most conducive to the play of the effect. Herbicides in low temperature weather, the effect is not ideal, try to use the drug above the average daily temperature of 6, 10 am to 3 pm about 10 o'clock in the afternoon weeding effect.

The time of weeding should be selected before winter, because the sensitivity of weeds to pesticides is very high during this period, and it is also necessary to have a good grasp of the temperature in early spring, which is generally very suitable from late March to early April.

It has to be done when the temperature is very high, so that the grass dies, so that the grass does not grow again, and it makes sense.

In fact, this temperature must be in a high temperature state, and it can be guaranteed that the roots of this grass are dried and will not grow again.

Seedling stage: Wheat weeding is generally carried out in November. After the year of rejuvenation:

In the Chinese New Year 2-3 months to control weeds, at this time weeds are generally larger, especially in recent years, many farmers sow late, some fields do not have the conditions for spraying herbicides before the year, so they must be sprayed after the year.

Wheat herbicides are effective when the temperature reaches more than 10 degrees. The minimum temperature is above zero, the average temperature is above 5 degrees, and the wheat is used before jointing. The use of wheat herbicides is generally carried out when the local average daily temperature is stable above 6, and the spraying effect is best when the temperature is about 10.

Precautions for wheat herbicides

1. There are many kinds of weeds in wheat fields, including more than 10 kinds of broad-leaved weeds such as Artemisia annua, Capsule, Pig Disaster, and Lacquer, as well as more than 10 kinds of gramineous weeds such as wild oats, Mai Niang, Japanese Mai Niang, and Jiejie Wheat. The herbicide varieties used for different weeds are also different, so it is necessary to choose the appropriate herbicide varieties in wheat fields according to the types of weeds in the field to achieve the ideal control effect.

2. The smaller the weed, the weaker the resistance, the larger the weed, the stronger the resistance, after the wheat 3 leaves, the weeds are basically out and the tissue is delicate. Generally, it is advisable to use medicine in early to mid-November, that is, about 40 days after wheat sowing, when the amount of weeds unearthed accounts for more than 90% of the entire growth period.

The above content reference: Encyclopedia - Herbicides.

Under normal circumstances, after the year of wheat field weeds, mainly to sow Artemisia, camellia, mother-in-law, wild oats, oats, lacquer, Jiejie wheat, etc., when to play herbicides appropriate, to see a few points, one is in the rejuvenation period, the second is the temperature to be suitable, the third is to pay attention to the spring cold, and the temperature is the most important, specifically to tell you in detail.

The effect of temperature on herbicides is very large, the temperature is too low, not only the effect can not be achieved, but also it is easy to appear pesticide damage, just after the New Year, the temperature at night may still be below zero, so it is necessary to find a suitable weather to play herbicides.

Because after the temperature is suitable, wheat and weeds have begun to recover, taking advantage of this period, weed resistance is not very large, in the sunny noon, when the temperature is greater than 10 degrees, you can use the medicine (if you look at the average temperature, to ensure that it is above 6 degrees), but also to remind me, when playing herbicides, look at the weather conditions after the weather forecast, to ensure that there is no sudden cooling, rainfall.

Among them, it is necessary to prevent sudden cooling, especially to pay attention to the "inverted spring cold", because this year's wheat in some areas of Henan has been affected by the "inverted spring cold", resulting in a reduction in output.

1. Pay attention to the spraying time, wheat is different from corn and soybeans, and the time of wheat herbicide should be selected from about 10 am to 15 pm.

2. The way of spraying should also be controlled, such as the same herbicide, which can be sprayed all over the field before the year, but in the spring of the year, it may not be sprayed in the whole field, and directional spraying is needed to avoid herbicides causing damage to wheat (some herbicides may add safety agents, and they can also be sprayed all over the field, but for the sake of safety, directional spraying is still recommended).

3. Pay attention to the change in the dose of herbicides, due to the spring after the year, the weeds will increase compared to the resistance, in order to achieve the effect of weeding, the herbicide dose can be appropriately increased, for example, a set of herbicides (a bag + a bag), a year ago, a set of medicine can hit an acre of land (667 square acres of standard acres), but in the spring after the year, under normal circumstances, play 7-8 points, the effect is good, if it is still a set of medicine an acre, there may be incomplete dead grass or ** situation.

I think the temperature of wheat herbicide should not be lower than 6 degrees, and more than 10 degrees is the best effect. Sunny weather with no wind or rain should be chosen.

Hello, time and temperature of wheat herbicide spraying: 1The best temperature for weeding with herbicides in wheat is 10-20 °C, which has a good effect and should not be applied under low temperature conditions.

2.- Herbicides are generally sprayed before wheat emergence, 3 leaves and 1 heart, and the appropriate herbicide is selected according to the type of weed. 3.

When applying pesticides, the average daily temperature shall not be lower than 5 °C, and the season is generally carried out in the time period when the temperature is higher, and the spraying is carried out in the afternoon when the temperature is lower in spring. 4.The effect of using herbicides in spring is not as good as before winter, and there will also be pesticide residues, which may affect the emergence and growth of the next crop.

5.According to the weather forecast, the spraying effect is good on sunny days, it is strictly forbidden to spray in windy weather, and it is not advisable to water immediately after spraying.

I'm glad to help you, if you're satisfied with my service, please give a thumbs up, and have a great day!

Above 10 degrees Celsius, because this temperature is the best temperature for wheat pesticides, and herbicides should also pay attention to the growth time of wheat.

If the temperature is above 5 degrees for three consecutive days, choose a windless period for spraying, be sure to spray evenly but never respray.

Not only are there many kinds of weeds in wheat fields, but there are also many types of wheat herbicides at present. But no matter what herbicide, after spraying, the agent can only play a role after being absorbed and conducted by weeds, so that the weeds die. Therefore, at what temperature to spray herbicides, in order to maximize the absorption and conduction of weeds to the pesticides, and it is particularly important to improve the control effect.

Numerous studies have shown that different herbicides have different temperature requirements.

At present, most wheat stem and leaf treatment agents are inhibitors of photosynthesis, these herbicides must operate with weed assimilates in order to cause systemic damage to weeds, the synthesis of assimilates is more, the operation is frequent, the herbicides can be better absorbed and operated, and the temperature will not only affect the rate of photosynthesis and respiration of weeds, but also affect the metabolic rate of herbicides in the body. Therefore, spraying when the temperature is generally high is conducive to the absorption of the agent, thereby improving the control effect. If the temperature is low, the light is not enough on a cloudy day when the spraying will not only have a bad control effect, but also easily cause wheat pesticide damage, such as butyl ester pesticide temperature above 18 sunny day spraying is better, dimethyltetrachloride, dicamba pesticide requires a temperature of more than 15 sunny weather can be sprayed.

Oat withering agent needs to be sprayed in fine weather when the temperature is above 20 degrees.

However, some herbicides have a better effect at low temperatures, such as 10 to 24, and the control effect decreases as the temperature rises. The herbicides such as Ruichaomai, Maishida, and Maixi are basically not limited by temperature when applied, and the application effect is stable even under low temperature and dry conditions, but the speed of the pesticide effect is effective. In addition, azolinolinate, alkynyl ester and other agents are usually more effective when used at low temperatures, and can be used at temperatures above 3 degrees.

But Sema. Agents such as Koshima and Pyroxamin should not be used at too low temperature, and should usually be used in fine weather with an average daily temperature of more than 8 degrees. For herbicides containing contact killing effects such as azole ketoxone, the spraying effect is generally better as long as the temperature is not lower than 5 degrees and the air humidity is greater than 60%.

If sprayed at a high temperature, although the contact killing effect of the herbicide is increased, uneven spraying will also lead to pesticide damage.

In short, the most suitable temperature for wheat weeding depends on the type of herbicide, and at the same time, soil moisture, wheat growth period, light and wind, weed size, etc., can be comprehensively considered to ensure that the control effect can be improved.

If the temperature is too low, it will not work, and the temperature must be controlled above 15 The effect will be better, if the temperature is too low, it will not work at all, and it may damage the roots of the plant.

No. It is better to have a temperature above 18, because this will ensure the normal development of the wheat, and then also ensure the yield and avoid affecting the normal development of the plant.

No, it is probably more than 20 degrees, because in this way, the weeding effect is better, and if you don't use herbicides, the effect can be better recovered and will not affect the soil quality.

Low temperatures within a week (especially within three days) after herbicide spraying can cause pesticide damage due to low temperatures. Spraying herbicides should be mastered:

1. The average temperature is 10 degrees, and there is no significant cooling in a week. 2. Do a good secondary dilution of herbicides. 3. There is no dew in the wheat field, the weather is windless or breezy, the soil is moist, 4 is not re-sprayed, no leakage is sprayed, and the amount of liquid medicine per mu is not less than 60 catties.

Herbicides can be applied when the average temperature is higher than 6, and besulfuron-methyl and other pesticides are more sensitive to temperature, and they are generally used under low temperature conditions, and it generally takes 15-20 days, or even 1 month later, to have a better control effect. It is necessary to apply herbicide on sunny days and when the temperature is slightly higher, generally at 10 am or 3 pm, if the land is dry, then you need to increase the amount of herbicide.

After reading so much, let's go back to the question at the beginning, the temperature is about 10 degrees during the day and about 0 degrees at night, can I apply herbicides? The answer is yes, but it is recommended to apply the pesticide between 10 a.m. and 3 p.m., and if there is wind, rain or a large drop in temperature the next day, even if the temperature reaches 10 degrees during the day, you should not apply herbicides.

Remind farmers that because the growth of wheat has to go through a winter, they should pay special attention when using herbicides, and they must not be determined according to their local temperature (wheat in the 3-5 leaf stage) because they have seen someone on the Internet say that they can play herbicides, and they must also play herbicides.

I used to grow wheat, and we used to grow wheat sporadically, and we generally had to weed 15 days after planting. The growth rate of wheat is definitely not as fast as some weeds, so we must wait about two weeks after planting wheat to weed, weeding should be carried out, weeding follows a principle, cutting weeds and roots. For large-scale planting, then they will definitely choose to use pesticides for mechanized operation, spraying pesticides can have a comprehensive effect, but we didn't plant much before, often manual weeding, we will directly uproot the weeds, put them in a place where the sun can get them, so that these grasses will not be close to the soil, and they will be dried to death.

Manual weeding has an advantage, then it can be removed by roots, but there is a disadvantage, the seeds can not be effectively killed, if sprayed with pesticides, then even the seeds of these weeds will be killed can save a lot of trouble. <>

Weeds grow vigorously in the spring, but there is also a wave in the autumn that can have a big impact, and weeding is very sure in the autumn and before fertilizing. If we want to fertilize and we do not weed, then these nutrients we fertilize will be absorbed by the weeds, so we must weed before fertilizing, whether it is pesticide weeding or manual weeding, in short, we must pull out the weeds. <>

The reason is very simple, if you don't weed, it will lead to insufficient absorption of nutrients in wheat, weeds grow more vigorously, it is easy to cover wheat, affect the lighting of wheat, seriously affect the yellowing of wheat, and even deteriorate, after all, the lack of nutrients will also directly affect the harvest of wheat.

Of course, when choosing pesticides, you must choose those pesticides that will not have an effect on wheat, otherwise you will be sprayed to death with wheat, which will be a big loss.