For the dilution problem in the use of pesticides , many farmers said that they could not understand. Today, Xiaozhi has compiled a super detailed pesticide dilution algorithm for everyone. I hope to help farmers. I must remember the collection!
First, the dilution method
The percentage concentration refers to the number of medicines and fertilizers in 100 parts of the fertilizer or medicine 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 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.
Third, the conversion method
The conversion formula for converting the percentage concentration into ppm concentration is: the number of water added to 1 pesticide = the percentage of pesticide × 1000000 / the number of ppm to be formulated.
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.
Fourth, converted into 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 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.
Five, watering method
When several pesticides are mixed, it is not necessary to add water once for each additional drug, but to use various drugs: the same concentration 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.
How to properly dilute pesticides?
When using pesticide products , the size and configuration of the pesticide concentration is related to the actual effect and effect of the pesticide spraying. Therefore, diluting the pesticide becomes a key part when using the pesticide. How to properly dilute the pesticide?
First, the representation of the concentration of the drug
1. Percent concentration
Refers to the number of servings of 100 active pesticides, often expressed in (%).
2 parts per million concentration
Refers to the number of active ingredients in 1 million pesticides, the symbol is PPm (or micrograms / ml; milligrams / liter; grams / cubic meters, etc.)
3, multiple method (ie dilution factor)
It refers to the multiple of water or other thinner (fine soil, granules, etc.) when the commercial pesticide is diluted.
Diluted 100 times or 100 times or less, to 1 parts by deducting the original drug agent occupied by the calculation, such as the 50-fold dilution of the original drug i.e. with 1 added portionwise 49 parts of diluent.
Dilute 10O times or more, the calculation does not deduct the number of parts of the original drug, such as 600 times dilution, that is, 1 part of the original drug plus 600 parts of diluent.
Second, the conversion between the concentration representation
1. Conversion between percent concentration and parts per million
Parts per million (ppm) = 10,000 × percent concentration
2, the conversion between the multiple method and the percentage concentration
Percent concentration (%) = (original concentration / dilution factor) x l00
Third, the calculation method when diluting pesticides
1, calculated according to the effective ingredients
(1) Use thinner (water or filler, etc.)
1 diluted 100 times or less:
Dosage amount = original drug weight x (original drug concentration - concentration of drug) / concentration of drug
2 diluted more than 100 times:
Thinner dosage = original drug weight x original drug concentration / drug concentration
(2) seeking medication
The dosage of the original agent = the weight of the drug to be dispensed x the concentration of the drug to be dispensed / the concentration of the original drug
2, calculated by the multiple method (do not consider the content of active ingredients)
(1) diluted below 100 times
Thinner dosage = original drug weight × dilution factor - original drug weight
(2) diluted more than 100 times
Thinner dosage = original drug weight × dilution factor
(3) Seeking the dose
The dosage of the original agent = the weight of the drug / dilution factor
(4) Find the dilution factor
1 by the concentration ratio to obtain dilution factor:
Dilution factor = original drug concentration / concentrated drug
2 by the weight ratio dilution factor:
Dilution factor = weight of drug dispensed / original drug weight
Concentration and concentration unit conversion
Solution concentration
The solution concentration can be divided into three categories: mass concentration (such as mass percent concentration) and volume concentration (such as molar concentration, equivalent concentration) and volume concentration.
1, mass percent concentration
The concentration of the solution is expressed as a percentage by mass of the mass of the solute as a percentage of the mass of the whole solution, and is expressed by the symbol %.
For example, 25% glucose injection refers to 25 grams of glucose in 100 injectables.
Percentage by mass (%) = solute mass / solution mass 100%
2, volume concentration
(1) molar concentration
The concentration of the solution is expressed by the molar number of the solute contained in 1 liter of the solution, and is expressed by the symbol mol. For example, 1 liter of concentrated sulfuric acid contains 18.4 moles of sulfuric acid, and the concentration is 18.4 mol.
Molar concentration (mol) = number of moles of solute / volume of solution (liter)
(2) Equivalent concentration (N)
The concentration of the solution is expressed as the equivalent concentration by the number of gram equivalents of the solute contained in the 1 liter solution, and is represented by the symbol N.
For example, 1 liter of concentrated hydrochloric acid contains 12.0 grams of equivalent hydrochloric acid (HCl) at a concentration of 12.0N.
Equivalent concentration = gram equivalents of solute / solution volume (liter)
3. Mass-volume concentration
The concentration expressed by the mass of the solute contained in the solution per unit volume (1 cubic meter or 1 liter) is called the mass-volume concentration and is expressed by the symbol g/m3 or mg/L.
For example, if 1 liter of chromium-containing wastewater contains hexavalent chromium with a mass of 2 mg, the hexavalent chromium concentration is 2 mg/L (mg/L).
Mass-volume concentration = mass of solute (gram or milligram) / volume of solution (m3 or liter)
4. Conversion formula of concentration unit:
(1) Equivalent concentration = 1000.d. Mass percent concentration / E
(2) mass percent concentration = equivalent concentration E / 1000.d
(3) molar concentration = 1000.d mass percent concentration / M
(4) mass percent concentration = mass - volume concentration (mg / liter) / 104.d
(5) mass-volume concentration (mg/L) = 104 mass percent concentration
5, ppm is the percentage of weight, ppm = mg / kg = mg / L
Namely: 1ppm=1ppm=1000ug/L; 1ppb=1ug/L=0.001mg
Where: E - gram equivalent of solute; d - specific gravity of solution; M - molar mass of solute;
1PPM is equal to how to convert? Secondly, PPM is a commonly used concentration unit in the world, because PPM is an English abbreviation, not the name of the calculation unit, that is, 1PPM=1x10-6, that is, 1PPM is one millionth of a concentration.
How to convert PPM concentration:
1G100% concentration of the drug diluted 1000KG water is 1PPM concentration, if the active ingredient of the drug concentration is 50%, then the 1G50% concentration of the drug diluted 500KG water is 1PPM concentration.
For example: How many times does it take to dilute water for 500PPM GA3 (100% content)?
100/500X10000=2000 times, that is, 1G diluted 2000G water is 500PPM concentration;
It can be substituted with the following conversion formula:
Pesticide active ingredient content (%) / liquid solution effective concentration (PPM) X10000 = water dilution factor
The above is the PPM conversion method. If you want to convert it, you can use the above formula to substitute.
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