Dilution method Percent concentration: refers to the number of parts containing 100 parts of pesticide active ingredients in the liquid medicine or powder, expressed by "%". For example, 2% urea means 2 kg of urea and 98 kg of water in 100 kg of urea solution.
Multiple concentration: refers to the water addition ratio of 1 part of pesticide, which is usually expressed by weight. For example, prepare 700 times of 50% carbendazim, which is made by mixing 50 parts of carbendazim with 700 parts of water.
Conversion method Percent concentration converted to ppm concentration: conversion formula is: 1 part of pesticide added water = pesticide percentage × 1000000 / number of ppm to be prepared. For example, the content of 40% ethylene is 1kg into a 2000ppm solution, and the amount of ethylene added is 40%×1000000/2000=200 kgppm.
Convert to multiple concentration: divide the percentage by the number of ppm and shift the decimal point back by 4 to get the dilution factor. For example, 40% of ethephon 1000ppm, when converted to a multiple concentration, use 40 ÷ 10000 = 0.4, the decimal point is shifted back 4 places, that is, 400 times. The pesticide network knows that when mixing several pesticides with water, it is not necessary to add water once for each kind of medicine, but the same amount of water is used to calculate the concentration of each medicine. 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 a mother liquid, that is, first use a small amount of warm water to open the liquid, then add water to the desired concentration, fully dissolve, improve the suspension, improve the efficacy, and prevent phytotoxicity.
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