According to the statistics of relevant departments, there are thousands of different types of herbicides in China. Currently, farmers' friends gradually accept and use 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 herbicides were used to kill undead weeds; others reflected that although they could kill grass, the rate of killing grass was not high; others said that killing grass also harmed crops; others complained that they killed The grass of the current season crops the seedlings of the next season.
In the face of problems arising from the use of disinfectants, we should analyze the reasons and take corresponding measures to better play 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, if there are more monocotyledonous weeds in Daejeon, the herbicides mainly used to kill the weeds will 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 weeding tree, 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 at different times are applied upside down. The effect of killing grass is not obvious, and some may even have negative effects.
In the full use of ecological conditions for production and application, although herbicides have been selected, if the ecological conditions are not paid attention to, and the herbicides are applied at will, 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 require strict temperature 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 silk in soybean fields. The second is to use drugs for different growth stages of crops. As with the use of 2,4-D, it is easy to control broadleaf weeds and sedges when applied in the rice sub-segment. 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.
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