How many hours does it take to spray wheat pesticides?

Wheat pesticides are effective after a few hours of spraying, and under normal conditions, they will be effective after two hours of spraying.

Generally speaking, the spraying of wheat only exceeds four hours, five hours, that is to say, it is effective, even if it rains, it doesn't matter, but the effect is reduced a little, when spraying, try to follow the ratio of pesticides and water to the good, must be in accordance with the proportion on the instructions to mix with water or not too effective, cause damage to wheat, if the efficacy is too low, will make the insect medicine immortal, so this aspect should be taken into account, don't spray it at that time, but also spray it, it will be labor-intensive, This is time-consuming and laborious, there is no benefit, in the water and, after the medicine is mixed in proportion, and then stir well, when spraying, we must do a good job of wearing protective equipment to prevent the effect of electricity into the eyes, so that you can spray the drug, try to spray in the ground when spraying, l don't this piece of that piece, when the spray is uneven, it is likely that the insects will not die, generally speaking, when spraying, it can be sprayed 1 to 2 pots per acre, generally speaking, two acres of land can be sprayed 3 to 4 pots, so that the effect can reach the highest limit.

After spraying, you should use soap, wash your hands and face to prevent poisoning, and be sure to send it to the hospital after reading it in public, and take the medicine bottle, so that the hospital will detoxify you according to what medicine, so you must pay attention to safety when spraying

Wheat pesticide spraying can take effect in about two hours, and all pests and diseases can be killed.

Under normal circumstances, it takes 3-5 days to water the wheat ears after being starved and herbicide. The efficacy of wheat herbicides is generally guessed to be effective within 3-5 days, in this case, you can water after 3-5 days of using herbicides, but some pesticides kill weeds and dig slowly, it takes a week to half a month or so to start slowly dying weeds, in this case, it is recommended to water after 7 days.

In the wheat seedling stage, mid to late November, it is a critical period for weeding, when the grass age is relatively small, and the resistance to drugs is relatively small, so it is easier to control.

In the wheat regreening period from late February to early March, it is also the best period for weeding, but at this time, the weeds are older and more resistant.

Farmers grow wheat, how can they achieve high yields. I believe this is a topic of common concern for farmers, in addition to water and fertilizer ** to keep up, do you know when herbicides are most effective? When are fungicides and foliar fertilizers used for maximum yield?

As long as you master these technologies, you will be able to achieve a yield of more than 1,200 catties per mu!

1. Chemical weeding before winter, if there is a wheat spider or aphid, it can be cured; 2. Prevention and control of sheath blight in the rejuvenation period, if there is a occurrence of wheat spiders or aphids, it can be treated at the same time; 3. For varieties with high stalks that are easy to lodging, spray chemical control before jointing (end of February - early March); 4. During the jointing-booting period, according to the occurrence trend of diseases and insects, control as appropriate; 5. Focus on the prevention and control of scab at the heading stage; 6...

Wheat, at what time, with what medicine.

When is the northern wheat sprayed?

1.Preface.

Weather is one of the very important factors for people who grow crops. During sowing, growing and harvesting, weather conditions can directly affect the growth and yield of crops. Therefore, in order to ensure the production and quality of crops before the state, farmers will adopt various methods of prevention and control, such as spraying, heat preservation, shading and other methods.

2.Wheat after spraying.

Wheat is attacked by various pests and diseases during the growth process, which can have a huge impact on the growth and yield of wheat. In order to control pests and diseases, farmers generally spray wheat with pesticides. Is it effective to clear the rain a few hours after wheat spraying?

In fact, it usually takes 6 to 8 hours for wheat to be fully absorbed after spraying, and if it rains during this time, the effect will be greatly reduced.

3.Effect of rain on wheat spraying.

For the case of rain a few hours after the wheat spray, we need to focus on the effect of the rain on the wheat spray. Rain washes away pesticides, reducing the concentration of pesticides. If the concentration of the agent is too low, the effect will not be significant, so that the due prevention and control effect cannot be played.

In addition, rain also brings about changes in temperature, which may affect the growth and development of wheat.

4.How to deal with it before and after rain.

If it rains a few hours after the wheat is sprayed, it must be treated promptly. For wheat that has been sprayed with pesticides, the development of growth traces can be promoted by supplementary fertilization and environmental adjustment. For wheat that has not been sprayed with pesticides, it is necessary to pay attention to spraying in time to maintain the appropriate concentration of pesticides.

5.Precautionary measures.

In order to avoid rain a few hours after spraying the wheat, we need to do a good job of weather forecasting before spraying. Try to avoid spraying on rainy days. In addition, it is important to pay attention to the amount and concentration of the agent to ensure that the amount of the agent is not too large or too small.

6.Epilogue.

Rain a few hours after spraying wheat has a negative effect on the growth and development of wheat. We need to raise awareness of prevention and control, do a good job in weather forecasting, and pay attention to the amount and concentration of pesticides. In this way, the growth and yield of wheat can be better guaranteed.

The best time to spray wheat is after 9 a.m. and after 4 p.m.

When spraying in the wheat flowering period or filling stage, it is generally chosen before 9 o'clock in the morning and after 4 o'clock in the afternoon.

The pre-spraying cycle of wheat is generally divided into three stages, that is, the wheat is often said to be sprayed three times, one is the rejuvenation period of wheat, the second is the full heading stage of wheat, and the third is the filling of wheat.

In the regreening stage of wheat, 20g of balanced foliar fertilizer and 30ml of rhizomestimulant were added to each bucket of water. The purpose of spraying: to speed up the wheat back to green, tillers become more and stronger. When there are many pests and diseases, kung fu and tebuconazole can be added to control it.

At the full heading stage of wheat, 4g of tebuconazole, 30 ml of kung fu, 8g of 10 imidacloprid fertilizer, 10g of boron fertilizer, and 50g of potassium dihydrogen phosphate were used per bucket of water In the filling stage of wheat, 4g of tebuconazole, 30 ml of kung fu, 8g of 10 imidacloprid and 50g of potassium dihydrogen phosphate were used per bucket of water.

The incidence of wheat pests and diseases in different regions is different, the specific spraying time, and the pesticides used are also different, please arrange the spraying time of wheat according to the actual local situation.

Wheat cultivation is requiredFine land preparation

Rotary tillage sowing has become the main sowing method of wheat. Rotary tillage sowing and suppression are generally completed at one time in dry land, and rotary tillage sowing after returning corn straw to the field in waterland is easy to cause the "virtual soil layer" to be too thick and the sowing depth is different.

Weak seedlings with too deep sowing, long seedling emergence period and high nutrient consumption not only affect the tillering before winter, but also susceptible to smut. If the sowing is too shallow, it is easy to cause "hanging seedlings", and the ability to resist drought, frost and lodging in the later stage is reduced.

Therefore, the sowing of land preparation should be deep, fine, thorough, flat, solid and sufficient. The deep repentance section is to plough more than 25 cm and break the bottom layer of the plow; Fine, that is, to rake the ground in a timely manner, and to rake the light and dark slashes; Flat means that the cultivated land is rough flat before ploughing, and it is flattened after ploughing.

The real is the upper and lower Panasonic, no leakage of ploughing and raking, no empty dark ridges; The soil moisture content of the clay soil should be more than 20, more than 18 loam, and more than 16 sandy soil, accounting for about 70 -80 of the water holding capacity in the field, so as to ensure that all seedlings are sown at one time.

The suitable time for spraying wheat is generally before winter, regreening stage, before jointing (from the end of February to the beginning of March), from the jointing period to the booting stage, the heading stage and the grain filling stage. Among them, the main work before winter is weeding, and if insect pests occur, they can be cured; The main work of the rejuvenation stage is the prevention and control of sheath blight; The main work before jointing is spraying chemical control; The main work from jointing stage to booting stage is to control pests and diseases; The heading stage is mainly used to control scab; The main control of aphids and sucking insects during the grain filling period is carried out.

The number of days before wheat flowering depends on the effective period of the specific pesticide.

Pesticide instructions will generally be listed.

Wheat cultivation techniques

The crop grows well on both acidic and slightly alkaline soils, but the most suitable soil pH is to.

Farming and land preparation.

The land preparation of the crop in the dry land should be based on the deep tillage layer year by year, combined with the application of organic fertilizer, and the improvement of water and fertilizer conservation, and the land preparation should be carried out according to different multiple cropping forms. That is, the previous crop harvested earlier, such as spring corn, sorghum, tobacco, etc., the harvest should first be shallow tillage to eliminate stubble, and then deep ploughing of the kang soil, so that the stubble rots and accept the autumn rain, shallow rake after the rain, reduce evaporation; The other kind such as sweet potato, cotton, etc., the harvest time is urgent, if the conventional method is used, it is bound to delay the sowing date, which is one of the important reasons for the low yield of the crop in the southwest region. Therefore, on the one hand, the implementation of loosening soil and protecting moisture between the rows in the previous crop and later period, and then plowing and leveling when planting wheat; On the other hand, it is advocated to dig potatoes, level the ground, fertilize, sow and other continuous operations to ensure that the crop is sown in a timely manner.

High-yield technology. 1. Pay attention to the selection of high-fertilizer and water plots. High-yield and high-quality crop varieties require that soil nutrients must be comprehensive and sufficient to meet the needs of high-yield cultivation, so it is advisable to choose plots with high soil fertility and good watering conditions, increase organic fertilizer, and adopt formula fertilization technology.

2. Pay attention to late sowing at the appropriate time, and determine the appropriate basic seedlings according to the characteristics of the variety. It is necessary to prevent excessive sowing volume, resulting in passive post-management.

3. Pay attention to prevent lodging and reapply jointing fertilizer. Some of the high-quality crop varieties promoted are not resistant to lodging, especially for wheat fields with too large groups, a chemical control treatment must be carried out before returning to jointing, and paclobutrazol or wheat yefeng can be sprayed. It is necessary to reapply jointing fertilizer to control the formation of excess falling ears and promote large ears and more grains.

4. Pay attention to watering grouting water, wheat yellow water, and spraying foliar fertilizer to prevent premature aging. Watering grouting water plays an important role in increasing granularity weight and preventing dry and hot air. In dry weather, the use of wheat water is conducive to intercropping and preventing premature aging.

In the first half of May, combined with the prevention and control of pests and diseases, spray 2 to 3 times of foliar fertilizer, such as potassium dihydrogen phosphate, which can reduce the harm of dry and hot air and increase yield.

5. Pay attention to the prevention and control of pests and diseases. Generally speaking, high-quality crops are more susceptible to pests and diseases, such as sheathrody and powdery mildew, and aphids occur earlier and heavier than conventional varieties. It should be prevented and treated as soon as possible according to the forecast.

6. Spray the crop treasure once when the crop has just broken and reached about 60% to 70% before heading and flowering, so as to activate the biological enzyme activity in the crop, promote coordinated growth, enhance the photosynthesis of functional leaves, significantly reduce the empty stubble rate, improve the seed setting rate and 1000-grain weight, so as to achieve the effect of increasing yield.