When using chemical herbicides, the following points should be noted:
First, the accurate selection of herbicides: a variety of herbicides, stem and leaf treatment agents, soil treatment agents, contact herbicides, natural herbicides. Some apply to pre-emergence weeding, and some apply to stem and leaf weeding. Therefore, weeds should be selected according to different crops and different periods.
Second, choose the correct method of use. Fluoride is easily photolyzed and must be sprayed on the surface of the soil and then covered with gums. The cable can be applied before emergence and after emergence. Duer, refined and can be used in the weed seedling stage, as long as the concentration is appropriate, it is safer for crops.
Third, protect crops from harm. Fields with more monocotyledonous weeds should choose herbicides that kill monocotyledonous weeds, and fields with more dicotyledonous weeds should choose herbicides that kill dicotyledonous weeds. For the field where the monocotyledonous and dicotyledonous weeds are mixed, the herbicide which can mainly kill the mixed weeds should be selected, but it should only be applied in the early stage of crop growth and the stage of weed initiation.
4. Use pesticides according to different ecological environments. The application of herbicidal ether under strong light is better, but trifluralin is more volatile and reduces the efficacy. Under high temperature conditions, due to the strong herbicide activity, the dosage should be reduced; as the temperature changes, the dosage can be applied according to the actual application. The soil treatment agent has a good application effect when the soil moisture is high. Soils with high organic matter content should be appropriately increased in dosage due to strong adsorption of herbicides. Sandy soil has good grass killing effect, but the phytotoxicity is also heavy, and the dosage should be reduced.
Fifth, the use of comprehensive supporting measures to prevent weeds. Although chemical weeding has a good effect, it has many kinds of weeds, long growth cycle, strong vitality, and often resurrects. In order to improve the effect of killing grass, one must do the early and the small; the second is to eliminate the weeds around the field; the third is to deep ploughing to remove the perennial deep root weeds; the fourth is to plough and annihilate the annual weeds.
This article is published by the China Pesticide Network . Please indicate the source.
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