Today's agriculture is almost inseparable from the use of pesticides , and some pesticides need to be diluted before use. What is the dilution requirement for pesticides? This article will explain in detail the dilution regulations for pesticides.
When spraying pesticides, you will definitely encounter problems with the preparation of liquid medicine. Pesticide preparations, whether they are wettable powders, emulsions or water-dispersible granules, have high concentrations. Direct use will definitely cause phytotoxicity. When used, it needs to be diluted to a safe concentration for crops. On the other hand, it is necessary to dilute a small amount of pesticide evenly into the field or on the crop. Dilution is to reduce the concentration, but if the concentration is too low, the effect will be lost. Considering that it is safe and effective, either when the drug is used, the concentration of the drug solution is limited, or the amount of the drug per unit area is limited. To this end, there are several provisions in the instructions for use.
For the preparation of the drug, the dilution factor is as follows: for the prevention and treatment of tomato green blight, use 14% solution of lycopene copper water solution or 50% copper succinate (DT) wettable powder 500 times solution. Use 1 liter of 14% lycopene copper water plus 300 kg of water or 1 kg of 50% copper succinate wettable powder plus 500 kg of water. Since 1 kg of water can be equivalent to 1 liter of capacity, the lysine copper is formulated in a volume ratio, and copper succinate is prepared in a weight ratio. Although they all have a little bit of error, they are completely negligible in field operations. A similar description is to specify the amount of medication per unit area and the amount of water exchanged. For example, the control of white-backed planthoppers can be controlled by using 25% of chlorpyrifos WP 30-40g per acre and 50-75 kilograms of water. This is the clearest and most common explanation.
For the prescription of the medicine, the application amount per unit area is as follows: control of rice leaf roller, using 48% chlorpyrifos EC 900-1500 ml per hectare, sprayed with water. There is no emphasis on the amount of water exchanged. Because the amount of liquid per hectare is different when using different application machines, the amount of water can be changed, but it is necessary to ensure the use of pure medicine or medicine per unit area. Most of the rules for using herbicides are the same.
In the above two cases, no calculation is required, as long as the weighing is ensured, it is safe and effective.
The concentration of the active ingredient in the prescribed liquid is usually specified in the instructions for use of the plant growth regulator. Due to the low concentration of the liquid, it is often expressed in parts per million or in "ppm". Now use more milligrams of active ingredient per liter of liquid, ie milligrams per liter. For controlling cotton growth, the spray concentration is 60-80 mg/L, which is 60-80 ppm of ketamine. If 25% water is used, the amount is 60-80 mg/L divided by 25%. It should be diluted with 240-320 ml of the drug with 1 liter of water.
More pesticide knowledge , please pay attention to China Pesticide Network
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