According to local conditions, accurate pre-emergence herbicide selection should be the selection of pre-emergent herbicides. Its mechanism of action is that it can be absorbed by young shoots, radicles, moderately bound to the soil, and less fluid in the soil. Guangmianling is the preferred chemical for weeding before sowing soybeans. In addition, Guangmiaoling has a short residual period and is safe for diarrhea. If used with acetochlor and tosulfuron, weeding effect is better. Soybeans before weeding, chemical weeding before the seedlings can not choose stem and leaf treatment and drift of a strong addition to the jade, such as Kekuole, fine grass, grams, 24d and so on. Strict drug standards, scientific mixed liquid soy after sowing before sowing herbicide chemical formula: 48% clomazone EC 70 ml ten 59% acetochlor EC 100 ml ten 70% soluprosol Soluble powder 2 grams, watered 30 kilograms, can spray a mu of land. When preparing compounded pesticides, the pesticides shall be added to the apparatus according to the standard. The powdered pesticides shall be diluted with a little clear water to be added into the apparatus after the mother liquor is added. Finally, the quantitative water shall be added. The instrument must not be filled with water before adding the chemicals to prevent water from being produced. Drugs are not fully dissolved and sprayed unevenly and have poor efficacy. Spraying at a proper time and ensuring adequate water supply Soybeans should not be sprayed immediately after spraying to prevent drought. Spring breeze affects efficacy, but it can't be too late. The correct method is: good locust plots are sprayed 3 to 4 days after sowing and plots with poor lye are sprayed 4 to 5 days before the emergence of the seedlings. In the spring season, the weather is usually windy and rainy, and soil moisture is poor. Therefore, in the application of pre-emergence weed control technology, we must pay attention to adequate water. Taking an air-injected sprayer that is driven by a small four-wheel tractor for agriculture as an example, its bulk density is 175-200 kilograms, and it is equipped with a high-pressure nozzle. The throttle speed is in the second gear of the forward speed, so that each tank can spray 6 to 7 acres, ensuring the use of mu. Water volume 30~35 kg. At the same time depending on the soil moisture and climatic conditions, it can be sprayed at any time with clear water, 20-30 kg per mu, in order to improve the efficacy.
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