Weeds in vegetable fields are a big problem in vegetable production. Manual weeding is laborious and laborious. In the production of vegetables, if the herbicide can be used correctly, it will achieve good results. However, there are many varieties of vegetables, high planting density, short growing period, high multiple cropping index, complicated mouthwash, and many varieties of herbicides. If used improperly, it is easy to cause pesticide damage or even rejection.
First, the rational selection of herbicide varieties. There are many varieties of herbicides, different herbicides have different weeding objects, and different vegetables have different adaptability to herbicides. Therefore, rational selection of herbicides is essential. According to the test demonstration, the following herbicides are safe and low-toxic to vegetables.
1, 48% trifluralin emulsifiable concentrate, 100-150 ml per mu, suitable for Chinese cabbage, Chinese cabbage, celery, radish, carrot, kidney bean, cowpea, used before sowing. Tomato, pepper, eggplant, kale, broccoli, evenly sprayed with weeds after planting, immediately mixed with water, mixed immediately after application.
2, 5% herbicide ether wettable powder 300-400 grams, suitable for kidney beans, cowpeas, carrots, celery, alfalfa, used before seeding after sowing, cucumber, tomato, pepper, broccoli, directional spray surface treatment after planting . It can also be mixed with 50% of the 50% WP WP 50g.
3, 50% turf net wettable powder 200-250 grams per acre, suitable for celery, old root leeks, carrots, alfalfa, soil treatment before sowing.
4, 33% Shi Tian emulsifiable concentrate 100-150 ml per mu, suitable for beans, potatoes, peas, live leek, cabbage, cauliflower. Watering after sowing application increases the efficacy. Solanaceae vegetables are treated with soil prior to planting.
5, 20% dichlorfen emulsifiable concentrate, 250-300 ml per mu, suitable for radish, cabbage, kidney beans, used before sowing. Eggplant, tomato, pepper, potato, watermelon, soil treatment before planting.
Second, improve the quality of medication. The efficacy of herbicides on weed control and the timing of drug use are closely related to the quality of the drug. Therefore, the following issues must be noted:
1. Master the dosage. It is necessary to achieve "two accurate", that is, the field area is accurate and the calculated dose is accurate. In the field with high organic matter content, the microorganisms are used to remove the herbicide, and the clay has an adsorption effect on the herbicide. Therefore, the dosage of such fields should be appropriately increased. Conversely, the dosage of the thin field and the sandy field should be reduced as appropriate.
2, master the time of medication. Trifluralin, dichlorfen, herbicide ether, chlorpyrifos and shitianbu are all soil treatment agents, which are mainly absorbed by the roots and shoots of weeds to inhibit the growth of weeds. It is usually applied before emergence or before planting after crop sowing. The herbicide treated on the stems and leaves destroys the splitting tissues by the stems and leaves of the weeds, and the time of administration should be in the three to six-leaf stage of the grass weeds.
3. The soil treatment agent must be sprayed after the rain or after watering, that is, when the soil moisture content is 20-30%, the soil should be mixed 2-3 cm deep in addition to the Fluorine spray, and other types of herbicides. Generally, it is necessary to protect the soil membrane and avoid soil mixing and trampling.
4. Master the amount of water used in medicine. Each acre of 25-30 kg of water must be evenly sprayed, and the sprayer used does not run, run, drip or leak.
5. When using herbicides in solar greenhouses and greenhouses, high temperature should be ventilated and ventilated to avoid phytotoxicity.
6. Cucumber, lettuce, and Artemisia selengensis are sensitive to trifluralin and chlorpyrifos herbicides. Celery and carrot are sensitive to dichlorpyrifos. Liliaceae vegetables such as leeks and green onions are sensitive to herbicide ether, and they have been used for the former. Fields of herbicides are also very sensitive and should be avoided in application and access.
The effect of herbicides on controlling weeds in vegetable fields and the safety of vegetables is closely related to the climate, soil quality, vegetable varieties and farming methods. Only strict and correct use can achieve the goal of labor saving, safety and high efficiency. .
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