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For the preparation of drug dilutions, such as: Control of eggplant bacterial wilt with 14% solution ammonia copper water solution 300 times or 50% copper succinate (DT) wettable powder 500 times liquid irrigate. That is, use 1 liter of 14% ammonia solution, 300 kg of water or 1 kg of 50% copper succinate WP and 500 kg of water. Since 1 kilogram of water can equate to a capacity of 1 litre, the amount of copper ammine is formulated according to the volume ratio, and copper succinate is prepared on a weight basis. Although they all have a little bit of error, they can be completely ignored in field operations. A similar description is to specify the dosage per unit area and the amount of watered. Such as the control of whiteback planthoppers per acre with 25% fluconazole 30-40 grams of wettable powder, add water 50 ~ 75 kg spray control. This is the clearest and most common explanation.
The prescribed amount per unit area for the preparation of medicines such as: control of rice leaf roller per hectare with 48% chlorpyrifos EC 900 ~ 1500 ml, watered spray. It is not emphasized here that the amount of water to be mixed is due to the difference in the amount of liquid medicine per hectare when the different application equipment is used, and the amount of water to be mixed may vary, but it is necessary to ensure the use of pure medicine or medicine in unit area. This is mostly the case with herbicides.
The above two cases do not require any calculation, as long as the single weighing can ensure that the concentration of the liquid is safe and effective.
The concentration of the active ingredient in the prescribed liquid usually appears in the instructions for use of the plant growth regulator. Due to the low concentration of the liquid, it is often expressed in parts per million or in "ppm". Now more than one milliliter of active ingredient contained in each litre of liquid, expressed as milligrams per liter. For controlling the growth of cotton, the spray concentration is 60-80 mg/l, that is, 60-80 ppm of dildoamine. If 25% of water is used, the dosage is 60~80 mg/L divided by 25%. It should be diluted with 1 liter of water to 240~320 ml.
Distinguish between the above three kinds of situations, it is no longer difficult to dispose the medicinal liquid.
Pay attention to pesticide dilution regulations
When spraying pesticides, you will certainly encounter liquid formulation problems. Pesticide formulations, whether wettable powders, emulsions, or water-dispersible granules, are relatively high in concentration. Direct use will certainly result in phytotoxicity, and they need to be diluted to a safe concentration for crops. On the other hand, it is necessary to dilute a small amount of pesticide evenly into the field or crop. Dilution is to reduce the concentration, but if the concentration is too low, it will lose its effect. Considering that it is both safe and effective, when using a drug, either limit the drug concentration or limit the amount of drug per unit area. For this reason, there are the following provisions in the instructions for use.