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In the face of problems when using herbicides, we should analyze the reasons and take corresponding measures to better exert the herbicidal effect.
Choose the herbicide correctly.
The effect of applying the herbicide is greatly related to the variety of the drug to be applied. For example, there are many monocotyledonous weeds in the field, and the herbicides that kill the dicotyledonous weeds are used to kill the monocotyledonous weeds. On the contrary, if there are more dicotyledonous weeds in the field, the herbicides mainly killing monocotyledonous weeds can also kill the dicotyledonous weeds. Among the herbicides, there are many varieties such as an amide herbicide, a sulfonylurea herbicide, a nitrobenzene herbicide, an organophosphorus herbicide, a phenoxycarboxylic acid herbicide, and the like. Some herbicides should be treated before planting, and some should be applied after sowing to pre-emergence, and some should be treated after emergence. If the herbicides treated in different periods are applied upside down, the grass killing effect is not obvious, and some may even have negative effects.
Make full use of ecological conditions.
In the production and application, although the herbicide is selected, if the ecological conditions are not paid attention to, the herbicide is applied at will, and the effect is often not satisfactory. For example, the herbicides Fluramine and Diltiazem, which are sensitive to light conditions, must be covered with clay when applying soil before sowing. Otherwise, it will be easily photolyzed and volatilized, which will affect the herbicidal function. Some herbicides also have strict temperature requirements. Both high temperature and low temperature can cause phytotoxicity, and the best herbicidal effect is in the proper temperature range. Dryland herbicides have strict requirements on humidity and soil moisture, and the lack of sensation is not good. If applied after suffocating in the rain, the efficiency of killing grass will be greatly improved.
Improve the level of application technology.
The first is to distinguish the situation and the amount of herbicide applied. Just like the use of glyphosate, the reeds of drought-resistant crops, 200-300 grams per acre, only 4 grams per acre when controlling the dodder in the soybean field. The second is to use drugs for different growth stages of crops. As with 2,4-D, it is easy to produce phytotoxicity before rice tillering, and it can effectively control broadleaf weeds and sedges during rice tillering. Third, the weeds have different fertility treatments. Fourth, according to different crops and different weeds, the method of surface application, point application or directed application is adopted. The fifth is to apply the herbicide flexibly according to the warmth, light and sensation.
How to better exert the effect of herbicides
According to the statistics of relevant departments, there are thousands of different types of herbicides in China. Currently, farmers' friends have gradually accepted and used chemical herbicides. Most users report that the herbicide is used in a small amount, with quick results, labor saving and cost. But when using herbicides, there are also many problems. Some farmers said that the use of herbicides still kills weeds; some reflect that although they can kill grass, the rate of killing grass is not high; others say that killing grass also harms crops; others complain, kill The grass of the current season crops the seedlings of the next season.
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