The plant protection and drone market has begun to mature. Undoubtedly, plant protection drones have brought good news to the integrated management of diseases and pests in agricultural fields, and it has also made it possible to mechanize this process. However, it is well-known that the root cause of pest control lies in pharmaceuticals, followed by mechanization. The special agent for flying defense is different from conventional pharmaceuticals. In this way, the pharmaceuticals will inevitably constrain the development of drones. In turn, the emergence of plant protection drones will bring about major changes in pesticide formulations.
How much do you know about the defense of the soul of flying defense? Do you calculate the density of pesticides? Tiantu Education This teaches everyone to calculate the density of pesticides. 
(a) Calculated on the basis of effective components:
1, calculate the amount of diluent:
(1) diluted 100 times or less:
Diluent dosage = weight of the original drug × (concentration of the original drug - concentration of the formulated drug) / concentration of the formulated drug Example: 4 kg of formalin (formaldehyde water) 5 kg, 5% liquid required, ask to add How many kilograms of water?
Solution: 5×(40%-5%)/5%=35(kg) 
2) diluted 100 times or more:
Diluent dosage: the weight of the original agent × the concentration of the original agent / the concentration of the agent Example: Diluted with 5% of 2,4-D auxin 1g into 20ppm somatotropin solution, how many kilograms of water should be added?
Solution: 5% concentration = 50000 ppm
Need to add water: 1×50000/20=2500 (g)=2.5 (kg) 
2, calculate the amount of raw drugs:
The amount of the original drug = the weight of the drug to be dispensed × the concentration of the drug to be dispensed / the concentration of the original drug Example: To be equipped with 20 ppm of 2,4-D 2.5 kg (2500 g), 5% (50000 ppm) of 2,4- D how many grams?
Solution: The original drug dosage = 2500×20/50000=1 (g) 
(b) Calculated by a multiple method (ie, without considering the active ingredient content of the original pharmaceutical)
1, calculate the amount of diluent:
Diluent dosage = weight of original drug × dilution multiple - weight of original drug Example: Use 20 kg of salt solution (5% saline) with 0.5 kg of salt, how many kilograms of water should be added?
Solution: need to add water = 0.5 × 20-0.5 = 9.5 kg 
2, seeking drug dosage:
The amount of the original drug = the weight of the dose of the drug / dilution multiple Example: Preparation of 48 kg of chlorothalonil 800 times the amount of chlorothalonil required kg?
Solution: 48/800 = 0.06 (kg)
3, the dilution ratio:
Dilution factor = weight of agent (or original concentration)/weight of original agent (or drug concentration)
Example: Using 25% metalaxyl 0.5 kg water to control 400 kg cucumber downy mildew, seeking dilution multiple?
Solution: 400/0.5=800 (times)
(iii) Inter-conversion of different concentrations:
1. Conversion between multiple method and percent concentration:
Percent Concentration (%) = Concentration of Drug/Dilution ×100
Example: Use 50% carbendazim WP 500 times to prevent and treat diseases, and ask about the percentage concentration of active ingredients containing carbendazim?
Solution: Percent concentration = 0.5/500 x 100 = 10% 2, conversion between percent concentration (%) and ppm concentration (ppm):
Concentration in parts per million (ppm) = percent concentration (%) × 1000000 (1 million)
Example: How many ppm is 5% 2,4-D auxin?
Solution: 5%=0.050.05×1000000=50000 (ppm)
3, how to convert into multiples of ppm?
The method is: divide the percentage by the ppm number and move the decimal point four places.
Such as 2.5% of the enemy killing 5ppm administration, with multiples as: 2.5/5 = 0.5, the number of decimal places after the four shifts is 5000 (times).
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