Rational use of soybean pre-emergence herbicides

According to local conditions, the pre-emergence herbicide should be selected before the pre-emergence herbicide is selected. The residual effect period of the chlorpyrifos is short, and it is the first choice for the safety of the sputum. Soybean pre-emergence chemical weeding is not optional Kekele, Jinghecao, 2,4-D and so on.
Strict standards, scientific compounding liquid soy soy after sowing pre-emergence chemical weeding formula is: 48% chlorhexidine EC 70 ml + 59% acetochlor EC 100 ml + 70% fensulfuron soluble powder 2 g, water 30 Kilograms can be sprayed on an acre of land. When preparing mixed pesticides, first add the pesticides into the appliance according to the standard, then dilute the powder pesticides into mother liquor with a little water, add the equipment, and finally add the quantitative water. Do not add the water to the appliance before adding the liquid to prevent water. The medicine is not fully dissolved and the spraying is uneven, and the medicine is inferior.
Spray at the right time to ensure that the water is sufficient. Soybean can not be sprayed immediately after spraying to prevent drought. The spring breeze affects the efficacy, but it can't be too late. The correct method is: the lyrical plots are sprayed 3 to 4 days after the sowing, and the plots with poor grievances are sprayed 4 to 5 days before emergence. Therefore, when applying pre-emergence weeding technology, we must pay attention to sufficient water. Take the air-jet sprayer pulled by the agricultural small four-wheel tractor as an example. Its weight is 175~200 kg, equipped with high-pressure nozzle, and the forward speed is in the second gear. So that each tank can be sprayed with 6~7 mu to ensure the application. The amount of water is 30~35 kg. At the same time, depending on the soil moisture and climatic conditions, it is possible to refill the water at any time, 20~30 kg per mu to improve the efficacy.