The use of pesticides is not good, and the diseases cannot be eliminated. For crops, proper dilution of pesticides can achieve the purpose of drug elimination. However, many farmers have no scientific basis in their use. Diluting ratios according to custom and soil methods are sometimes used. There may be counter-productive effects. Xiao Bian sorted out several commonly used pesticide dilution precautions today to share with you.
I. Dilution of liquid pesticides
When the amount of liquid is small, it can be directly diluted. The correct method is to pour one-third of the fresh water into the prepared medicine container first, then pour the quantity of medicine slowly into the water, then fill it with water, and mix it with a wooden stick and then use it gently.
Second, the dilution of wettable powder pesticides
Two-step preparation method is adopted, that is, a relatively small amount of water is used to prepare a relatively thick mother liquor, and then the liquid pesticide is diluted according to the method of preparation.
Third, the dilution of powder pesticides
The main use of fillers for dilution. First take the filler (grass ash, rice bran, etc.) Mix the required powder pesticide into the mix, and then add it repeatedly until it reaches the required multiple.
IV. Dilution of granule pesticides
Use suitable fillers to mix with it. Dilution can use dry soft soil or acid-alkali uniform fertilizer as filler, and mix evenly according to a certain proportion.
In addition, for the problem of dilution ratio data during the use of pesticides, many farmers said they couldn't read it and needed a detailed pesticide dilution algorithm. Please note the following:
1. Dilution method: Percentage concentration refers to the number of parts containing medicine and fertilizer in 100 medicinal fertilizer liquids or medicinal fertilizer powders, and is represented by “%â€. For example, 2% urea means 2 kg urea and 98 kg water in 100 kg urea solution
Second, the multiple concentration: refers to a pesticide multiple of water, commonly used to represent. For example, the preparation of 700 times 50% carbendazim is done with 1 part of 50% carbendazim and 700 parts water.
Third, the conversion method: conversion formula converted from percentage concentration to ppm concentration is: 1 part of the pesticide plus the number of water = the percentage of pesticides 1000000 / to be prepared in the number of ppm. For example, the ethylene content of 40% is equated with 1 kg of a 2000 ppm solution, and the amount of water added to ethylene ethoxide is 40% of 1000000/2000=200 parts.
Fourth, converted into multiple concentration: the percentage divided by the number of ppm, the decimal point is shifted back by 4, that is, the dilution ratio. For example: 40% ethephon 1000ppm, when converted to multiple concentration, with 401000 = 0.04, 4 decimal places backward shift. That is 400 times.
Fifth, watering method: When mixed with several pesticides, not every drug plus one water, but all kinds of drugs are used: the same amount of water to calculate the concentration. For example: 500 times the urea plus 1000 times the thiophanate methyl, is 2 parts of urea plus 1 part thiophanate methyl water plus 1000 parts. In addition, when the water, it should be dubbed mother liquor, that is, a small amount of warm water to the liquid liquefaction, and then add water to the required concentration, fully dissolved in order to improve efficacy, to prevent injury.
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