If the pesticide is not used well, the disease can't be removed. For the crop, the correct dilution of the pesticide can achieve the purpose of removing the drug from the disease. However, many farmers have no scientific basis in the process of use, and the dilution ratio is used according to the habit and soil method. There may be counter-effects. Xiaobian today sorts out several common pesticide dilution considerations and share with you.
First, the 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 water into the prepared dispensing container, then slowly pour the quantitative drug into the water, then fill it with water, stir it evenly with a wooden stick, etc.
Second, the dilution of wettable powder pesticides
The two-step preparation method is adopted, that is, a relatively thick mother liquid is first prepared with a small amount of water, and then prepared according to the dilution method of the liquid pesticide.
Third, the dilution of powder pesticides
Mainly using the filler for dilution. First, fill the filler (grass ash, rice bran, etc.) and mix the required powder pesticides into the mixture, and then add them repeatedly until the desired multiple is reached.
4. Dilution of granule pesticides
Use a suitable filler to mix with it. When diluting, use dry soft soil or acid-alkaline chemical fertilizer as filler. Stir well at a certain ratio.
In addition, for the dilution ratio data in the process of pesticide use, many farmers said that they do not understand, need a detailed pesticide dilution algorithm, as follows:
1. Dilution method: The percentage concentration refers to the number of parts containing medicine and fertilizer in 100 parts of medicine or liquid fertilizer powder, which is expressed by “%â€. For example, 2% urea means 2 kg of urea and 98 kg of water in 100 kg of urea solution.
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 medicine is added, water is added once, but all kinds of medicines are used: the same 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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