People often ask, how do you dispense medicines in the agricultural production process, dilution factor, ppm, how to calculate the amount of water and medicine. If you don't know these, the concentration will be high in the process of compounding, and the concentration will be low to prevent insecticide. Faced with a variety of pesticide use instructions, many farmers' friends are confused, and even some agricultural operators are uncertain, which is the real problem of current agricultural production. Today, we will systematically introduce the three most common methods for representing the concentration of pesticides in agricultural production in China and their respective calculation methods. It is hoped that it can guide farmers' friends in compounding pesticides. At present, most pesticides in China have labeling pesticides on their labels. The most common ones are the following three methods: 1, the percentage concentration This is the most common, many conventional pesticides are identified as such, expressed in %, which means that the content of active ingredients in 100 parts of the drug, liquid and powder oil. 2, the multiple method is also more common, expressed in multiples, the amount of diluent added to a portion of the drug solution or powder is a multiple of the original drug amount. For a simple example, if you need to prepare 700 times 30% carbendazim, it means mixing with 30 parts of carbendazim and adding 700 parts of water. 3,ppm This is the most troublesome sign for farmers. Don't talk about farmers' friends, that is, many farmers' shop owners don't know what it means. When I farmed a farmer, you gave me English, which made me feel awkward. Many farmers have no way to do this. Start. The so-called ppm is the concentration of the spray liquid in the application of the pesticide, that is, the number of parts of the sprayed liquid containing the active ingredient of the pesticide. Then the question comes, how do you accurately calculate the required amount of the three identified pesticide concentrations? This is the focus of today. Let's continue to look down. First of all, we first popularize several knowledge points: 1. 1 g of pesticide (1 g) = 1 ml (1 ml); 2, 1 liter (l) = 1000 ml = 2 kg; 3. The sprayer capacity of farmers in agricultural production is 16 Li, that is 32 pounds of water. First look at the calculation method of multiple number identification: Take 1 kg of water (500 ml) as an example, use 500 ÷ dilution factor to get the pesticide dosage of 1 kg of water, and then multiply the amount of water you need to use to get the total use of pesticides. the amount. Namely: 500÷ multiple × water consumption (jin) = pesticide use (ml). For example, carbendazim 1000 times, the formula: 500 ÷ 1000 = 0.5 ml, that is, one pound of water with 0.5 ml of medicine. A sprayer is 16 liters (32 kg water), 32 x 0.5 = 16 ml, which is 16 grams. A sprayer can be used to take 16 grams. Looking at the next percentage concentration, this is also relatively easy to calculate. For example, the 8% of the original drug, the net weight of 200 grams, diluted 5000 times need to add how much? Diluted 5000 times, which is 8% / 5000 = 0.0016%, the commonly used sprayer is 16L, which is 1600 * 0.0016% / 8% = 3.2 grams, that is to say, diluted 5000 times need to add 3.2 grams of medicine on it. This one ppm is the most complicated and the most difficult to understand. Ppm is also called parts per million. For example, 1ppm is one millionth, 150ppm is one hundred and fifty parts, etc., that is, when formulating 1ppm concentration, 1g of pesticide or fertilizer (referred to as scalar) plus 1 ton of water (1000000g), So on and so forth. These pesticides or fertilizers are generally only a few percent or tens of percent sterling, and Others are fillers. Therefore, when formulating the concentration of pesticides or fertilizers, the amount of water added should be determined according to the pure content of the pesticide or fertilizer and the concentration to be diluted (in ppm units). The calculation formula is: water added per gram of pesticide or fertilizer = 1000000 × drug (fertilizer) content (%) ÷ concentration (ppm) For example: need to use 15% paclobutrazol to make 300ppm liquid, spray rice seedlings, 1 gram How many grams of water do you need to add pesticides? According to the calculation formula, the calculation is as follows: Water addition amount = 1000000 × 15% ÷ 300 = 500 (g) That is, 1 gram of 15% paclobutrazol plus 500 g of water can be formulated into a 300 ppm paclobutrazol solution. If you don't understand it, you can convert it to a dilution factor and then calculate it. Dilution factor = original drug concentration * 1000000 / parts per million concentration ppm. The above is the calculation method for the most common three kinds of pesticides in agricultural production. I hope that farmers friends can apply what they have learned. At the same time, for farmers who do not count, some agricultural resource dealers now give farmers a measuring cup in order to avoid the peasants' multi-use of phytotoxicity. The marking line is marked above, and then the number of pesticides used is also well marked. It's fine to do the comparison, which is a good way. If you have any questions, please feel free to leave a message in the comments section.
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