Soybean fields should pay attention to the following three major issues when using chemical herbicides:
According to local conditions, the selection of drugs is accurate. The herbicide should be selected as a pre-emergent herbicide. The residual phase of the chlorpyrifos is short and safe for the sputum. It is the preferred agent. Soybean pre-emergence chemical weeding is not optional Kekele, Jinghecao, 2,4-D and so on.
Strict standards, scientific mixing of liquid medicine. Soybean sowing pre-emergence chemical weeding formula is: 48% chlorhexidine EC 70 ml + 59% acetochlor EC 100 ml + 70% fensulfuron soluble powder 2 g, 30 kg of water, can spray 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 sufficient water. Soybeans can not be sprayed immediately after spraying to prevent the weather such as drought from affecting the efficacy, but not too late. The correct method is: lyrical plots are sprayed 3-4 days after sowing, and plots with poor grievances are sprayed 4-5 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 second-shift in the throttle, so that each tank can be sprayed 6-7 mu to ensure the mu 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.
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