In recent years, China's agricultural technology has become more developed, and farmers' lives have become better and better. And pesticides have gradually become an indispensable agricultural accessory in agriculture. Proper use of pesticides can increase production, so how to use pesticides correctly? What should I pay attention to when using the agricultural process? Today, Xiaobian will introduce you to several common pesticide use points.

1. How does the herbicide spray do not affect the crop?

1. Different herbicides should be selected according to different soil characteristics, microbial species, climate and irrigation conditions. The herbicide containing chlorsulfuron-methyl is mainly degraded by hydrolysis in the soil. When the field is alkaline soil, the rainfall is low in the year, and the soil is dry, the residual period in the soil is often prolonged. In the case of acid soil, soil moisture or irrigation of farmland, the residual period is shortened and the later crops are relatively safe.

2. Before planting the crops, it is important to know whether the herbicides applied in the previous crops have phytotoxicity to the crops. If the herbicides containing chlorsulfuron-methyl or metsulfuron-methyl components, such as wheat straw, wheat straw, etc., have been applied before, the corn, soybean, cotton, peanuts and other crops cannot be planted, and they cannot be used as polders.

3. Improve application methods and reduce soil residuals.

(1) The dosage should be accurate, the spraying should be uniform, no leakage, no heavy spraying;

(2) The period of use should be flexible. The soil treatment can be carried out before the plant is broadcasted, before the seedlings, or after the seedlings;

(3) Rational application of drugs. Mixing chlorsulfuron with 24-D butyl ester reduces the amount of chlorsulfuron by 50%. Pussite soil treatment can be mixed with trifluralin, acetochlor, alachlor, sikkon, etc.;

4. Under normal circumstances, the application time is better when the temperature is greater than 20 degrees. The systemic herbicide has a good effect in the evening, and the contact herbicide has a good effect in the morning. Try to avoid using high temperature during noon.

Second, how to use plant growth regulators?

1. Master the correct concentration, method of use, use of the site, etc., as in the case of melon, the use of ethephon can promote the main vine to open the female flower early, but must be 4 to 6 true leaf stage when used, easy to use early The phytotoxicity; the use of 24-D in the solanaceous vegetables is easy to cause phytotoxicity. The prevention method is to grasp the concentration of use, and make appropriate adjustment according to the growth and temperature of the plant at the time of use.

2. First test to determine the most suitable concentration, and then promote it in large areas. The application effect of plant growth regulators is closely related to the concentration of use. If the concentration is too low, it will not produce the desired effect; if the concentration is too high, it will destroy the normal physiological activities of plants and even damage plants.

For long-term crops, the concentration of the retardant can be higher. If it is too long or even uncontrollable, it can be applied 1 or 2 times.

For growing crops, the concentration of the retardant should be lower, once.

Long-growing crops do not delay growth, and it is not necessary to apply growth retardants.

3. Pay attention to the climatic conditions at the time of use. The concentration of the application should be reduced in arid climate conditions; conversely, in the rainy season, the concentration should be appropriately increased. The application time should be at 10:00 am and 4:00 pm. It is not suitable for application in windy weather and when it is about to rain. Applying half or full amount of liquid medicine in case of rain 4 hours after application.

4. The parts and methods should be used correctly. When a plant growth regulator is applied, the treatment site is determined according to the purpose of administration and the principle of pharmacodynamics. If 24-D prevents falling flowers and fruit drop, it is necessary to apply the medicine on the flowers to inhibit the formation of the separation layer. If the young leaves are treated with 24-D, it will cause damage.

Attachment: Misunderstanding of pesticide use

1. Pursuit of quick-impactness. Many vegetable farmers always like to choose quick-acting when choosing pesticides, because the quick-acting pesticides will soon show their effects after use. Although some farms have a good effect, they are not effective for the farmers because of the slow performance. Pursuit of quick-acting properties when using insecticides, and hope to kill pests immediately after spraying. However, some biological pesticides such as Bt or avermectin insecticides are not easy to show effects because they only kill eggs or inhibit insect molting or slow effect, and are often not recognized by vegetable farmers. The most serious consequence of the quick-acting effect of vegetable farmers is that the use of highly toxic, highly toxic and high-residue pesticides in some places still exists, and the residues of pesticides produced exceed the standard.

2. Blindly pursue new differences. At present, there are many kinds of pesticides on the market, and there are some pesticides that are “three positives”. Some farmers prefer to use newer pesticides. Although the use of new pesticides can prevent certain pests and diseases from becoming resistant, many pesticides are mainly used as a compounding agent, which will increase the amount of use and cause phytotoxicity. At the same time, some pesticide products have not been promoted, and their effects are not well understood, and problems are prone to occur.

3. Too much dependence on the efficacy of certain pesticides. Many pesticides have a scope of application. When purchasing pesticides, they will be bought and used as long as they are marked. If some pesticides are indicated to cure fungi, bacteria, viruses and other diseases, they will be purchased as good pesticides.

4. Excessive application. Many vegetable farmers use pesticides excessively. When using agricultural contracts, the dosage is several times or even ten times that of commonly used drugs, which often causes phytotoxicity.

5, can not be the right medicine. This is a common problem in the current vegetable production. Many vegetable farmers lack the necessary knowledge of plant protection, and cannot diagnose correctly after the onset of symptoms, but blindly use drugs. Especially when vegetables lack certain nutrients, the wrong application of another fertilizer can not only cure the disease, but may increase the disease.

6, a variety of agents mixed use. A major problem currently exists is that many vegetable farmers use five kinds of fungicides together with micro-fertilizers, insecticides, and viricides, which not only affect the efficacy, but also cause phytotoxicity and affect crop growth.

These are the main points of use of herbicides and plant growth regulators introduced today by Xiaobian. Proper use of these pesticides can have a multiplier effect.

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