Second, the multiple concentration: refers to the water addition multiple of 1 part of the pesticide, commonly used to express. For example, prepare 700 times of 50% carbendazim, which is made by mixing 50 parts of carbendazim with 700 parts of water.
3. Conversion method: The conversion formula for converting the percentage concentration into ppm concentration is: the number of water added to one pesticide = the percentage of pesticide × 1000000 / the number of ppm to be prepared. For example, the content of 40% ethylene is 1 kg of a 2000 ppm solution, and the amount of ethylene added is 40% x 1000000/2000 = 200 parts.
4. Convert to multiple concentration: Divide the percentage by the number of ppm and shift the decimal point back by 4 bits to obtain the dilution factor. For example, 40% of ethephon is 1000 ppm, and when converted to a multiple concentration, 40 ÷ 1000 = 0.04, and the decimal point is shifted back to 4 places. That is 400 times.
V. Watering method: When several pesticides are mixed, not every time one kind of medicine is added, the water is added once, but the same amount of water is used to calculate the concentration. For example, 500 times of urea and 1000 times of methyl thiophanate are prepared by adding 2 parts of urea plus 1 part of methyl thiophanate plus 1000 parts of water. In addition, when watering, it should be formulated into mother liquor first, that is, first use a small amount of warm water to open the liquid, then add water to the desired concentration, fully dissolve, to improve the efficacy and prevent phytotoxicity.
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