What are the application skills of pesticides for vegetables in winter greenhouses?

The biggest skill of greenhouse pesticides is that we should pay attention to the distance when spraying, and when there is time to spray, we should pay attention to the coordination of some water and pesticides.

The skill of applying pesticides is to pay attention to the angle of pesticide spraying, the way of pesticide spraying, the time of spraying pesticides, and the proportion of pesticides.

First of all, it is necessary to choose the time when the temperature is more suitable, you can choose at 10 o'clock in the morning on a sunny day, and you should choose the right pesticide according to different vegetables, and you must pay attention to the ratio and dosage of pesticides.

First of all, we should choose the right pesticides, but also should prescribe the right medicine, ensure sufficient light, timely watering and fertilization, strengthen the management of water and fertilizer, but also need to choose high-quality fertilizers, you can choose some pesticides, or fungicides, we must pay attention to the proportion of pesticides and the problem of dosage.

It is necessary to carry out light, and at the same time pay attention to the humidity in the greenhouse, and apply pesticides in combination with the temperature in the greenhouse, and pay attention to the problems of pesticide damage.

To ensure the moisture of the soil, it is necessary to grasp the ratio of water and pesticides, pay attention to the time of spraying, pay attention to the scope of spraying, and ventilate regularly.

Different crops in different seasons of cultivation contains the best pesticide time is not the same, under normal circumstances, summer and autumn high temperature season vegetable greenhouse application time is best in the middle of the day around nine o'clock in the morning, in the afternoon at about four o'clock. The dew is dry at nine o'clock, and it is also the time when the pests are most active, so it is best to spray at this time. After four o'clock in the afternoon, the light begins to weaken, the temperature drops significantly, and some pests that appear at night begin to be active.

In winter and spring, the temperature is low, and the best time to spray is between 2:30 and 3:30 in the afternoon. The temperature in the greenhouse is low in the morning, and it is necessary to raise the temperature to increase the photosynthesis of vegetables, if the spraying will reduce the temperature and affect the growth of vegetables, choose to spray in the afternoon when the temperature of the greenhouse drops, which will not affect the normal growth of vegetables, and the pesticide will also have a long-term absorption process, and the insecticidal effect is undoubtedly the best.

So what are the times or weather conditions that are not suitable for spraying pesticides? In windy weather, pesticides will flutter around with the air and will not easily adhere to the surface of crops, affecting absorption. Cloudy or rainy days are not suitable because they will wash away the agent directly, not only will the crops not be able to absorb it, but it will also cause river water pollution.

The weather is not suitable for spraying at noon on a sunny day, because the high temperature will accelerate the decomposition of the agent, increase the volatilization, and shorten the validity period of the pesticide, which is very unfavorable.

In addition, the use of pesticides must be the right medicine, some pesticides are more humid, the better the effect, and some are too low the temperature will not have obvious effects. For example, wheat spraying should be at the heading stage, corn application can start at the seedling stage, and fruit tree spraying is best after the autumn harvest, which are all points that need to be paid attention to.

Source: bilibili

1. Herbicides.

Herbicide refers to a type of substance that can completely or selectively kill weeds, also known as herbicides, to eliminate or inhibit plant growth.

2. Acetochlor.

Acetochlor is a widely used herbicide. Successfully developed by Monsanto in 1971, it is one of the most important herbicide varieties in the world and one of the most widely used herbicides in China.

3. Buchlor.

Buchlorachlor (2-chloro-N-(2,6-diethylphenyl)-N-(butoxymethyl)acetamide) is a selective pre-budding herbicide. It is mainly used for direct seeding or transplanting of annual grass weeds and some broad-leaved weeds in paddy field control. It is also selective for wheat, barley, sugar beet, cotton, peanut and cabbage crops.

4. Paraquat.

Paraquat, chemically known as 1-1-dimethyl-4-bipyridine cationic salt, is a rapid herbicide with contact killing and systemic effects. It can be quickly absorbed by the green tissues of plants, causing them to die. It has no effect on non-green organizations.

It quickly binds to the soil in the soil and passivates it, and is ineffective on plant roots and perennial underground stems and roots.

5. Quinoxalin.

Quinoline is a chemical with the molecular formula C17H13ClN2O4. According to China's pesticide toxicity grading standards, Quinograss is a low-toxicity herbicide. Its light yellow uniform crystalline, the total ester content is higher than 95%, and the R body is greater than 90%.

There are many varieties of pesticides commonly used in greenhouse vegetables, and it is difficult to say how many specific ones are dazzling, and they can only be roughly classified for reference:

1. According to the use, there are insecticides (insecticides, acaricides, rodenticides, underground pests), fungicides (bacterial, fungal), herbicides, and plant growth regulators.

2. According to the ** points, there are inorganic pesticides, bio-derived pesticides, synthetic pesticides (organic pesticides) 3, according to the dosage form: emulsifiable concentrate (EC), suspension concentrate (SC), water emulsion both concentrated emulsion (EW) and microemulsion (ME), wettable powder (WP), water-based (also known as water-based) dosage form and water-dispersible granules (WDG), fog agent, etc.

4. According to the way of use: spraying, root irrigation, fumigation, powder spraying, etc.

Generally speaking, fruits and vegetables that are easy to grow insects and are difficult to control after insects are often varieties with serious pesticide pollution. For example, pesticide residues such as apples, pears, plums, grapes, strawberries, watermelons, oranges, and bananas in fruits are more serious, while fruits with shells such as lychee and longan are less polluted. Vegetables with heavy pollution include leafy vegetables and fine vegetables, such as Chinese cabbage, green cabbage, chicken hairy cabbage, leeks, spinach, rape, etc., while root vegetables, melon vegetables and fruit vegetables (such as potatoes, pumpkins, cucumbers, bitter gourds, tomatoes, squabs and onions) are relatively less polluted by pesticides, and the nutrients of these vegetables are also higher.

There is no scientific truth for the statement that "there are no pesticides when buying vegetables with insect eyes". Because it is difficult for vegetable farmers to kill all pests at the same time when spraying, after a long time, the pests will become resistant, and when vegetable farmers spray again, they will escape, and then "kill will come back". Therefore, the presence of insect eyes on vegetables does not necessarily mean that there are no pesticide residues.

In addition, the skin of vegetables has a layer of wax, which can play a role in preventing pests and toxic substances. Once the skin of vegetables is damaged, various bacteria and other pathogenic microorganisms will take advantage of the void to enter, which is not conducive to human health.

Ask the specific in**Go to wholesale.

At this stage, farmers in many areas of our country have used greenhouses to carry out production work, and in the process of greenhouse vegetable planting, pesticide spraying is also a lot of concern. It's winter now, and if you don't grasp the method of pesticide spraying, you can't give full play to the effect. When arguing with the configuration, it is also necessary to pay attention to the fact that too much water can not be added, which will lead to a reduction in the effect of pesticides, which will not only make the pesticide ineffective, but also not eliminate pests, and even immediately lead to the outflow of pesticides, resulting in ecological and environmental problems, and the harm is more serious.

Generally speaking, we do not expect to use pesticides in the case, can not add too much water, if the application of too much water, will lead to the evaporation of pesticide water into the air, so that the pesticide power is reduced, will also make the pesticide can not be applied, so before the application of pesticides, we must determine whether the pesticides they choose are suitable for their own pesticides.

The use of pesticides is also very critical, its application, must fully consider the frequency of pesticide use, if the application frequency is too much, it will lead to poor pesticide power, will also endanger the quality of pesticides, so the amount of pesticides is very important, in the amount of pesticides is too much, will lead to many, the frequency of pesticide use is too much, will destroy the characteristics of pesticides, but also lead to the consumption of pesticides. Pesticide use too much, it is very easy to lead to the problem of field environmental pollution, and it is very easy to produce many diseases, so in the case of the application of pesticides, we must control the amount of use, can not be used too much, if too much, pesticides will lead to a significant reduction in the power of pesticides.

The use of pesticides should also be noted, if the wrong operation of pesticides, it will lead to the consumption of pesticides, and will lead to many problems, so the application of pesticides, we must pay attention to the operation methods, can not operate incorrectly, pesticide resistance will be many, and will also produce environmental pollution to surface water, and the related components in pesticides will be accompanied by the volatilization of water, from the ground according to the pores on the road surface into the soil layer, and then increase the amount of pesticide residues.

Greenhouse vegetables can be exempted from chemical fertilizers.

A backpack-sized device that can "cure the disease" of insect pests based on the high concentrations of ozone that is produced and released. Shaanxi Zhengxing Electronic Technology Co., Ltd. research and development of this kind of greenhouse vegetable prevention instrument, will enable many greenhouse vegetables without chemical fertilizer to achieve the purpose of preventing pests, for the production and manufacturing of green organic food has brought another technical guarantee. Ozone is an oxidant, which has a strong practical effect on all kinds of insects and bacteria, and at the same time, it also has a strong potato dissolution effect on chemical fertilizers and organic chemical harmful substances, <>

It remains in the air for a period of time and then dissolves automatically and becomes O2. When the insect inhales ozone, the strong chemical effect of ozone will break the inhalation and circulation of the two, suffocating it to death, so as to achieve the purpose of insect control. Ozone can also destroy the somatic cells and membrane organs of various bacteria, killing somatic cells.

Ozone pest control has the characteristics of zero pollution, no residue, no dead ends, etc. It is playing an increasingly critical role in the future of agriculture.

Top dressing fast-acting fertilizer: After the seedling repair of frozen vegetables, the fast-acting basal fertilizer and phosphorus and potassium fertilizer can be topdressed immediately to promote the repair and growth of the main stem of vegetables. Before ultra-low temperature, potassium dihydrogen phosphate solution can be sprayed 1-2 times to improve cold resistance or 1 mu of dilute human and animal manure water 400-500kg, which can alleviate the thawing level of the soil layer and reduce chilling damage.

Topdressing 50-100 quintals of fire soil ash or grass ash in the vegetable garden can not only prevent cold and frost, but also have the effect of topdressing potassium fertilizer, and have excellent practical effect on the prevention of cruciferous vegetable brown spot disease.

Spray water or evapotrant: After 2-3 days of light frosting, the vegetables and seedlings planted in the shed should be shaded for a short time around the afternoon to prevent sudden lack of water and wilting due to strong light. According to the environmental humidity conditions, spray a small amount of clean water at noon to increase the ground temperature and environmental humidity, inhibit the drying and drying of the frozen mechanism, and promote the moisture absorption of the frozen mechanism.

3-4 days before the arrival of the cold snap, spray 30-40 times the liquid ** vapor inhibitor on the main stem of vegetables on a sunny day, and generate a layer of invisible antifreeze film on the leaves, which is conducive to reducing the plant respiration of the leaves, maintaining the human body temperature of vegetables, and achieving the purpose of anti-freezing.

Water injection and heat insulation: Irrigating or watering the frozen vegetables can improve the thermal conductivity of the soil layer, avoid the soil temperature from decreasing again, and alleviate the cold damage. Watering should be watered enough, after pouring water or watering, grasp the beneficial stage of rising temperature, turn over the soil and heat insulate.

Pruning and pruning: Immediately after frosting, cut off the frozen leaves of the young shoots. Even if the end of the pepper seedling is frozen, it can still sprout branches with good medical care, take one of the strong branches instead of the petioles, and cut off the other branches. After pruning and pruning the small celery cultivated in the open field, new shoots can also emerge.

Rush to sow seeds: In order to reduce property losses, you can rush to plant low-temperature resistant broccoli, greens, radish vegetables, and oily wheat vegetables after the weather warms up. It is best to rush to sow in China and small sheds, early budding, early growth and development.

A good way is to dilute the pesticide with water and then put it in a noisy watering can to use it, so that the pesticide application surface is more pure and efficient, and the vegetables can be protected.

You can use the grinding erection control instrument, you can use ozone, you can strengthen the management of greenhouse vegetables, to prevent pests and diseases, you can blindly attack to select high-quality varieties of fiber people, so that you can remove pests and diseases.

We must pay attention to the soil situation, pay attention to care, pay attention to watering, pay attention to fertilization, and choose the right varieties, so that we can avoid agricultural pesticides to a large extent.

You can ventilate more, and the sedan car will be fertilized, or more sunlight, or frequent watering, and you can close the vertical to learn the management and management skills of the greenhouse, so that you can not apply pesticides.

Frequent ventilation, scientific management of the cover, you can use a sedan car to flush some smoke and fog annihilation things, fertilization is also effective, and the temperature is well controlled, which can reduce the virus.

Choose a reasonable time to take medication. During the day, the temperature is high and the water evaporates quickly. It is easy to increase the concentration of the liquid after spraying, especially in the middle of the day.

We should choose to use the drug before 10 a.m. or after 16 p.m., which can reduce the occurrence of drug damage. We should always be aware of changes in the weather. Before it rains, we should take the medicine 1-2 days in advance.

The high incidence of viral diseases and various pests requires a variety of pesticides to control them.

Spraying is also time-consuming and labor-intensive. Therefore, many vegetable farmers will mix and add various pesticides every time, so that chemical reactions between different pesticides can not only not achieve the control effect, but also lead to the occurrence of pesticide pests. Don't mix it up blindly.

If pesticides and copper agents cannot be used in combination with foliar fertilizer, the effect of single spraying of foliar fertilizer is better. Spraying should be targeted, and the most serious diseases should be prevented and controlled first. Cover the greenhouse with plastic film or add a small arch.

Mulching can increase the temperature of the surface soil2, and the addition of small arch canopies can keep the temperature of the vegetable growing environment above 15. Using iron wire instead of bamboo poles and bamboo film, and using plastic ropes instead of bamboo poles as attachments, can reduce shade and improve photosynthetic efficiency. The purpose of planting vegetables in greenhouse mulching is to artificially create a suitable ecological environment, adjust the vegetable production season, adjust market demand, and promote high quality and high yield of vegetables.

It is an effective means to increase peasants' incomes. The suitable climate provides out-of-season vegetables, which completely solves the situation of relying on the weather to eat vegetables.

Especially in the northern region, people have fresh vegetables in winter, which is also the most important place for vegetable protection in China. We should apply fertilizer in a balanced way to promote the stable growth of vegetables. Completely decomposed organic farm fertilizer should be applied throughout the year; Apply refined organic fertilizers such as Ye Meifeng and high-energy organic fertilizers.

Change the way of local nitrogen and phosphorus application, reduce nitrogen, stabilize phosphorus, increase potassium, and apply micro-fertilizer. Fertilizer should be applied in batches and in an appropriate amount; If fertilizer damage occurs, a variety of active liquid fertilizers must be sprayed to mitigate the damage.