With the popularization and application of light rape cultivation techniques, chemical weeding has become a key technical measure in rapeseed production. However, due to the differences in production conditions, scientific and technological qualifications, and planting and management levels among farm households, the application of chemical weeding techniques is often unsatisfactory, the weeding effect is poor, and the harm caused by pesticides has occurred from time to time. Several proposals for chemical weeding in rapeseed are proposed here. problem:
The first is to use selective herbicides. The best is to use the selective herbicides of the systemic type because the weeds in rapeseed field are symbiotic with rape. After being absorbed by oilseed rape, these herbicides are quickly decomposed and converted into non-toxic substances. Rape does not cause any harm; but the absorption of certain weeds will destroy the body's metabolism and cause the death of weeds.
The second is to use herbicides with a shorter residual period to reduce residual pollution.
The third is the scientific application of herbicides.
1, rapeseed sowing, transplanting before the treatment of soil to control grass weeds can be used mainly trifluralin EC 100 to 150 ml per acre, watered 40 to 60 kg, after the flat surface after spraying with mixed soil , sowing or transplanting after 2-4 days;
2. The use of rapeseed before sowing after sowing, the main pesticides for control of grass weeds or broad-leaved weeds are butachlor, quinones, herbicide dan, green mellon, etc., after the sowing of rapeseed, unearthed before the weeds, Select one (dosage with reference to the instructions for use) and spray 40 kg of water. When both grassy weeds and broad-leaved weeds need to be controlled, chlorotoluron can be used in combination with herbicidal and butachlor.
3. Control of grass weeds after rape seedlings can be used to control grass weeds, Ganoderma lucidum, quinoxazone, etc. can be used to control broad-leaved weeds. High-tech can be used to prevent and treat broadleaf weeds. Wang Wang, and so on. In a word, one or more matched sprays may be selected for the occurrence of weeds. In addition to the general election time in the field weeds grow to 3-6 leaves or a strong period of growth, about 40 kg per mu of water.
Fourth, pay attention to the use of protective cover when applied, try not to spray when there is wind in order to avoid phytotoxicity.
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