First, the method of use 1. Soil treatment Before the seeding after sowing, or before emergence, the herbicide is sprayed, sprinkled or poured onto the soil. After the application, the soil layer is generally not required to be applied to avoid affecting the agent. However, for herbicides with low volatilization, photolysis and mobility, when the soil is dry, the soil layer should be mixed 3 to 5 cm deep after application. When spraying, generally 30 to 50 kg of liquid per 667 m2. The most commonly used soil treatment agents are trifluralin, lasso, dur, henis, and dilamine. 2, stem and leaf treatment in the use of herbicides to prevent weeds during crop growth, should use a more selective herbicide, or spray in the growth stage of crops with strong resistance to herbicides, or directed spray. Generally, about 30 kg of liquid per 667 m2 is used, and the conventional spraying method is adopted. Cotton, rapeseed, sesame, soybean and other dry crops are usually selected from fine grasses and grasses. Paddy fields usually use farmhouse rich, Tiancao, and Jingkecao. 3. Paddy soil The moist fine soil or fine sand and herbicide are mixed according to the specified ratio, and are mixed into the dough, which can be spread out when sprinkled, and then covered with plastic film pile for 2 to 4 hours. Apply evenly to the field water after the dew is dry. When applying the soil, the middle of the field should maintain a water layer of 3 to 5 cm, and it is effective for 5 to 7 days after the water is sown. 4. Applying the herbicide mulch film to cover the cultivated crops, and it is inconvenient to weed after mulching. It is necessary to spray 30~50kg of the pre-emergence herbicide dilution solution per acre after sowing, and then cover the film. The herbicide is applied on the film, and the dosage is generally reduced by 1/4 to 1/3 compared with the conventional dosage. Second, reasonable mix In production, people use herbicides often in combination with two or more herbicides to achieve the purpose of killing multiple weeds at the same time. But not all herbicides can be mixed. Therefore, the following principles must be followed when mixing herbicides. 1 mixed herbicides must kill different grass spectrum. 2 mixed herbicides, the use of the appropriate method must be consistent. It should be 1/3 to 1/2 of a single amount. Herbicides that cannot be mixed can also achieve the purpose of killing a variety of weeds if they are used in stages. For herbicides that cannot be mixed, there are usually three ways to apply them: 1 different soil treatment agents are used interchangeably. Such as the use of trifluralin to kill grass weeds this year, and then use the grass to kill broadleaf weeds next year. 2 pre-soil soil treatment combined with post-emergence stem and leaf treatment. 3 herbicides with different herbicides. It can be used to kill the weeds with Wo Da Zhuang, and then use the herbicide to kill broadleaf weeds and sedge weeds. Third, matters needing attention 1. It is necessary to use the drug according to the regulations strictly. The herbicide applied before the seedling can not be applied after the seedling; the agent suitable for soil treatment cannot be used as the stem and leaf treatment. For example, the soil treatment agent trifluralin cannot be used as stem and leaf treatment. 2 medication should be suitable: the application of herbicides during the sensitive period of crops can easily cause phytotoxicity in crops. Therefore, when using herbicides, avoid the sensitive period of the crop and choose the best period. For example, the herbicide application in the wheat field is from the four-leaf stage to the jointing stage. 3 When the stems and leaves were treated, the effect of weeds 2 to 4 leaves was the best. 2, to properly mix the pharmaceutical liquid to prepare herbicide liquid, first dissolve the wettable herbicide in a small amount of water to make the mother liquid, then install the semi-spray water, pour the mother liquid, then add the required water, and finally evenly Apply. If the wettable powder is mixed with the emulsifiable concentrate, the wettable powder should be made into the mother liquor, then the emulsifiable concentrate should be poured, and finally the necessary water is added to spray evenly. 3, should pay attention to weather conditions herbicides should not be sprayed in high temperature, high humidity or windy weather to prevent crop damage or reduce drug efficacy. In general, spraying herbicides should be carried out in a sunny and windless weather at 20 to 30 °C. If it is sprayed when there is wind, the direction of the nozzle should be consistent with the wind direction. Towards the wind, it is necessary to spray the wind head first, then spray the wind head to prevent the liquid from drifting with the wind and harm sensitive crops nearby. 4, to see the soil quantitative soil treatment of the plot, one must be fine and flat, and spray evenly, otherwise it will reduce the efficacy. The control effect of soil-treated herbicides and the phytotoxicity to crops are decremented by the order of sand, loam, and sticky soil. Therefore, the amount of sand soil should be reduced, and the amount of sticky soil should be increased appropriately. 5, to see weed medication chemical control to prevent perennial weeds, to increase the amount of drugs, some contact herbicides are not effective for perennial weeds, should pay attention to choose to use. 6. Thoroughly clean the sprayer that sprays the herbicide, and then thoroughly clean it before spraying other drugs to prevent phytotoxicity to the crop.
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