Vegetable field weeds are a harm to the production of vegetables. Manual weeding is laborious and laborious. In vegetable production, most vegetable farmers need to use herbicides. However, there are many varieties of vegetables, a short production period, a high multiple cropping index, and a more complex herbicide, and there are many varieties of herbicides. If they are used improperly, they can easily cause phytotoxicity and even yield no harvest. I have passed tests and demonstrations of herbicides for several years. Investigations and studies have found that herbicide must be used in vegetable fields as follows:
I. Reasonable selection of herbicides
There are many varieties of herbicides. Different herbicides have different herbicides. Different vegetables have different adaptability to herbicides. Therefore, the rational selection of herbicides is very important. According to tests and demonstrations, the following herbicides are safe and low-toxic to vegetables.
148% trifluralin EC, 100-150 ml per acre, suitable for Chinese cabbage, Chinese cabbage, celery, radish, carrots, beans, cowpeas, soil treatment before sowing and tomato, pepper, eggplant, cabbage, cauliflower before colonization.
225% herbicidal WP 300 to 400g for soil treatment of kidney bean, cowpea, carrot, celery, alfalfa before sowing and cucumber, tomato, pepper, broccoli before colonization. It can also be mixed with 50% Praxapol WP 50g for better results.
350% paracetamol WP is 200-250 g/mu, used for soil treatment before celery, roots, leeks, carrots, and pods are sown.
433% Shitian make-up cream, 100~150 ml per acre is suitable for soil treatment before bean planting, potato, peas, leeks, cruciferous sowing, and planting of solanaceous vegetables.
520% Napropamide EC, 250-300 ml per mu, suitable for radish, cabbage, beans before sowing and soil treatment before eggplant, tomato, pepper, cabbage, potato, watermelon colonization.
Second, improve the quality of medication
Herbicides have a close relationship with the control effect of weeds and the timing of the use of vegetables and the quality of medications. Therefore, we must pay attention to the following issues:
1 master the dosage. Must be "two accurate", that is, the area of ​​the plot is accurate, and the drug dosage is calculated accurately. In the fields with high organic matter content, the microorganisms can relieve herbicides, and clays have an adsorption effect on herbicides. Therefore, the dosage of these fields should be increased appropriately. On the other hand, the dosage of thin field and sandy fields should be reduced as appropriate.
2 master the medication time. Trifluralin, Napropamide, Herbicidal Ether, Praxanthine, and Shi Tian Bu are all soil treatment agents. They are mainly absorbed by the young roots and young shoots of weeds, and they inhibit the growth of weeds. It is generally applied before or after the sowing of the crop. The herb is a stem and leaf treatment agent, which is absorbed by the stems and leaves of the weeds and destroys the splitting tissues in the plant body. The application time should be appropriate during the third to sixth leaf stage of grass weeds.
3 The soil treatment agent must be sprayed after rain or after watering, that is, when the soil moisture content is 20% to 30%, remove the 2-3% of the soil in time after spraying with flurazin to prevent photolysis. Types of herbicides generally have to protect the soil surface film, avoid mixing and trampling.
4 master the medication on the amount of water. 25 to 30 kilograms of water per acre of agent, must be evenly sprayed, the sprayer used no run, run, drip, leak phenomenon.
5 When using herbicides in greenhouses and greenhouses, high temperatures should be ventilated to prevent phytotoxicity.
6 Cucumber, lettuce, and garland chrysanthemum are sensitive to trifluralin and paraquat herbicides. Celery and carrots are sensitive to chlorfenapyr. Liliaceae vegetables such as leeks and scallions and spinach are sensitive to herbicide ether, and they are used in the former. The field of herbicides is also very sensitive, and care should be taken to avoid application and sporadial use. The effectiveness of herbicides to control weeds in vegetable fields and the safety of vegetables are closely related to the climate, soil quality, vegetable varieties and cultivation methods in different regions. Therefore, the use of each herbicide must follow the “test and demonstrationâ€. And promote the principle of "promoting labor, safety, efficiency, and productivity."
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