In the case of secondary dilution of the pesticide, the pesticide preparation is first diluted with a small amount of water or a diluted carrier into a mother liquor or a mother powder, and then diluted to a desired concentration, which has many advantages over the one-time dispensing.
1. To ensure that the agent is evenly dispersed in water. For example, wettable powders and powders tend to agglomerate into coarse granules. If the granules are dispensed directly into the medicine tank, the coarse granules are not fully dispersed or sink into the bottom of the water. At this time, stirring is difficult, which is not conducive to uniform spraying. For example, the deposition phenomenon of the rubber suspension is prone to be deposited during the storage process, ie, the upper layer gradually becomes thinner and the lower layer becomes thicker. A two-step method must be used to prepare the drug solution.
2 is conducive to accurate medication. With the development of high-efficiency agriculture in recent years, only a dozen grams (or milliliters) or even a few grams of pesticides are needed per acre of land, and the amount allocated to each sprayer is less, and if sprayed directly on water, each barrel (15 (Kilograms) Only 2 grams of medication is used. Once formulated, it is not easy to weigh accurately and difficult to dilute evenly.
3. It can reduce the risk of pesticide poisoning. Some of the more toxic pesticides have a chance of exposure to the original drug four times using the one-time dilution method, while the secondary dilution method only takes one time, the possibility of poisoning is greatly reduced, even if the liquid is exposed again later, it is also a good mother liquor. The probability of poisoning is greatly reduced.
It is conservatively estimated that the performance of pesticides that do not undergo secondary dilution will be 15% to 20% worse than that of pesticides that undergo secondary dilution. For some powders and water-dispersible granules, secondary dilution should be advocated.
For secondary dilution of pesticides, use a medical saline bottle or other small container with a volume scale, place the pesticide in the bottle, and inject a proper amount of water into the mother liquor. For those with severe viscosity, such as suspension agents, The agent adhered on the small package is washed down, gently stirred so that the agent in the container is fully dispersed and dissolved, and then used in a measuring cup. If you use a knapsack sprayer, you can make a direct dilution in the tank. First add a small amount of water to the sprayer, add an appropriate amount of liquid, shake well, and then make up the water and mix well. If the sprayer is used for spraying a large area, larger containers such as barrels and cylinders may be used for the first dilution of the mother liquor. The secondary dilution can be formulated in a sprayer pail and mixed for use.
In order to ensure the dilution quality of the liquid, the amount of water used to prepare the mother liquor should be carefully calculated and carefully measured, and should not be used arbitrarily or less frequently, otherwise it will directly affect the control effect.
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