For herbicide application, consider the next crop
Today is the time when herbicides are used, but if the herbicides are used improperly, it is easy to have phytotoxicity problems. What is the correct way to use herbicides? For herbicide application, consider the next crop, let us know about it. Let's go.
1, do not be cheap
When selecting a drug, check the herbicide use label, active ingredients, date of manufacture, and product license. Do not buy cheap and fake products.
2, correct drug selection
Different herbicides target different crops, such as butachlor and acetochlor, bensulfuron-methyl and chlorsulfuron-methyl, although they are all only one word, but one is used in paddy fields and one is used in dry fields. Even in the same crop, the herbicides applied are different at different growth stages or in different mantle (season) crops. For example, when selecting post-emergence herbicides, some corn varieties are more sensitive to nicosulfuron, which is prone to phytotoxicity, such as Zhengdan 958 and Yuyu 22. Some products indicate that it is forbidden to use on corn inbred lines, sweet corn, waxy corn and other varieties. Pay attention when choosing.
3, consider the next èŒ¬
Some herbicides have long residual effects, which can affect the seedlings of the lower (season) sensitive crops, which are not long, rotten or dead. Therefore, when using herbicides, it is necessary to consider what crops are to be planted in the next season (season). In the following seasons, beet, potato, melon, sorghum, rice, cotton, vegetables, etc., cannot use atrazine or chlorine. Sulfasulfuron and chlorsulfuron are used as herbicides for the last season crops; when sowing soybeans and wheat, the use of atrazine for the upper crops should be reduced by half. Different crops have different sensitivity to different herbicides. When selecting herbicides, we must pay attention to the impact on the lower and lower season crops.
4, scientific dispensing
It is recommended to use the second dilution of the compound, firstly prepare the original drug into a mother liquid, and then mix the water thoroughly to form a liquid medicine to avoid the "flower face" weeding effect due to uneven mixing.
5, strict dosage
Some farmers like to increase the concentration of herbicides at will, and many pesticide distributors also like to recommend high-concentration pesticides to farmers, which is very dangerous. Increasing the concentration at random can lead to phytotoxicity. For example, acetochlor can cause soybean damage, and 2,4-D butyl ester can cause corn phytotoxicity. When using a single herbicide, it should be noted that the safe and effective dose of the herbicide and the actual area of â€‹â€‹the corn field should be used to calculate the dosage. For the mixture of two or more herbicides, the herbicidal spectrum must be different, but the applicable crops, period and method of use are basically the same. The amount of each herbicide should be 1/3-1/2 of the conventional dosage. The amount of liquid per acre (after the raw liquid is watered): no less than 30 kg of soil-treated straw-free field, not less than 45 kg of straw returning; when the stems and leaves are treated, the weeds are not less than 30 kg. The weeds are no less than 45 kilograms.
6, timely application of drugs
Soil closure is generally applied 1 week after sowing, when weed seeds begin to germinate. Post-emergence weeding should be â€œspray small and not spray oldâ€, and grasp the weeds from the two leaves to the four leaves and one heart during the concentrated application. The spraying time should be carried out before the 9:00 am or after 5 pm in the windless weather. Use at high temperatures. In the case of dry weather or lack of moisture in corn fields, it is necessary to increase the amount of water in a timely manner, generally not less than 45 kg per mu. Do not re-spray or leak when applying the medicine, and the amount is even.
7, to prevent drift
It is forbidden to use drugs on windy days and hot noon to avoid phytotoxicity. Each crop has some sensitive pesticide varieties. For sensitive crops, only a small amount of herbicide can cause phytotoxicity. For example, dicotyledonous plants such as grapes and soybeans are sensitive to 2,4-D butyl ester. 2,4-D butyl ester droplet drift can affect grapes 100 meters away; acetochlor on cucumber, spinach, wheat, millet, sorghum, etc. Crops are not safe, Atrazine is not safe for vegetables, pears and peach trees.
8, pay attention to humidity
When sealing treatment, attention should be paid to humidity, so that the surface of the soil is wet, which is beneficial to the formation of the film. After the seedling treatment, if it rains after spraying, it should be sprayed again.
9, fixed-point application
The 2~5 leaf stage of corn is the best spraying period for post-emergence weeding. If you miss the best period and must weeding, you should spray it along the ridge. Do not spray all the fields to avoid causing phytotoxicity.
10, used alone
Corn herbicides are required to be used alone, and cannot be mixed with insecticides . In particular, do not mix with organophosphorus pesticides to avoid phytotoxicity. Accurately grasp the interval between drugs. The herbicide and pesticide should be used at least 5 times. day.
11, maintenance equipment
Spray equipment must be repaired before application to prevent run, run, drip, leak and other problems. Before applying the pesticide, spray it with clean water to accurately calculate the spray width, walking speed and area to be sprayed. Thoroughly clean the spray equipment after applying the herbicide to avoid phytotoxicity.
12. Timely remedy
After the key is generated, a large amount of water should be sprayed, and at the same time, field management should be strengthened, phosphorus and potassium fertilizers should be added, and quick-acting fertilizers such as urea should be sprayed to enhance the viability of the corn.
Today's introduction to the use of herbicides is here. To get more knowledge about pesticides , please pay attention to China's pesticide network.
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