First, the spraying device and dosage can be harvest type-5 or harvest-10 hand-type powder duster, requiring the nozzle's wind speed is more than 8 meters per second. The harvest speed of the Harvest-5 hand crank should reach 36 revolutions per minute, and the harvest-10 must reach 50 revolutions per minute. The purpose is to produce enough strong wind to make the powder evenly discharged. The amount of powder discharged is regulated to be about 200 grams per minute. Generally, 1 kilogram of dust agent is used per acre, and only 5 minutes is required to process 1 acre shed.

2. Preparation of booths for powder spraying Before the spraying, the vents and doors of the booths should be closed. The plastic film should be used to cover the booths tightly. It should be sealed as far as possible. If the plastic film is damaged, it will not affect the dust.

Third, the best time to spray powder spraying time is in the morning or evening, the pod has not been uncovered or just after the closure, so that the deposition rate of the powder on the crop is higher. It should be avoided at noon on sunny days, and it can be sprayed at any time on cloudy days. Ventilation can be turned on two hours after spraying. According to the disease every 7 to 10 days spray 1 time.

Fourth, dusting method Greenhouse: The use of retrograde horizontal spray method, that is, from the beginning of the greenhouse, the operator stood on the aisle, back to the northern wall of the greenhouse, facing the south side, while spraying, while retreating, until exit the door ,Close the door. If there is residual medicine, the powder spray tube can be sprayed into the room from the upper air outlet and sprayed until the powder is sprayed. Greenhouses: Using left-right swing spray method, starting from the north end, the operators stood on the aisle and sprayed dusting pipes to spray powder on both sides. While spraying, they retraced and retraced until exiting the south entrance and closing the door. Small and medium arch sheds: The shed is sprayed on the outside of the shed, or the shed is partially uncovered on one or both sides of the shed, and the dusting pipe is projected into the shed for spraying. The nozzle sways.

5. Points and Precautions for Powder Spraying When spraying powder, the powder must be evenly sprayed into the space of the greenhouse. It is not appropriate to spray the powder spray tube at the plant line by line. Otherwise, the deposition is not uniform. When operating, pesticide safety operation regulations should be observed. Wear long-sleeved overalls, wear goggles, masks, and protective caps. After the work is completed, you must wash your hands and other exposed skin.

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