Pesticide concentration and dilution calculation method

In the course of controlling crop pests and diseases, some farmers’ friends have some misunderstandings about the concentration of pesticides used and dilution calculation methods, resulting in the phenomenon of drug injury. The pesticide concentration and dilution calculation method are now described as follows:

First, the concentration of pesticides Pesticide concentration is usually a percentage of the concentration, the concentration of millions and multiple method three representations.
(1) Percent Concentration (%): This is the active ingredient of how many parts of a hundred parts of a drug are contained. For example, 50% "XX" EC means that 100 parts of this EC contain 50 parts of "XX" active ingredient.
(2) Parts per million (ppm): This is the number of active ingredients in one million doses of pharmaceuticals. For example, 300 ppm of "XX" means that one million parts of this solution contains 300 parts of the "XX" active ingredient.
(3) multiple method: the amount of diluent (water or filler) in the liquid (or powder) is the multiple of the original dosage, that is, how many times the dosage is diluted. If 50% "XX" EC 800 times, it means 1 kg 50% "XX" EC should add 800 kg of water. Therefore, the multiple method generally cannot directly reflect the active ingredient of the drug. According to the size of the dilution required, the internal ratio method and external ratio method are usually used in production applications.
Internal comparison method: This method is used to dilute agents that are less than one hundred times (including one hundred times), and the amount of the original agent should be deducted when calculating the dilution amount. If it is diluted 80 times, use 1 part of the original drug plus 79 parts of thinner.
Outer ratio method: This method is used to dilute more than one hundred times and the drug. When calculating the dilution amount, it does not deduct one part of the original drug. If it is diluted 1500 times, use 1 part of original drug plus 1500 parts of thinner.

Second, dilution calculation method
1. According to the calculation of the active ingredient, the general formula: the concentration of the original agent, the weight of the original agent = the concentration of the diluted drug, the weight of the diluted drug. Example: Use 50% "XX" cream mixed with wheat seed, the effective concentration of seed dressing is 0.5%, and how many wheat seeds can be mixed with 10kg of the drug ?
Solution: 50% 10 = 0.5% X, obtained X = 1000kg, you can mix 1000kg seed.
2. Calculate the general formula according to the dilution factor: Dilution agent weight = the original agent weight dilution multiple Example: Prepare 50% "XX" EC 1000 times spray, ask how much water is needed for 1.0kg of the EC?
Solution: X = 1.01000 = 1000kg, that is required to dilute 1000kg.

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