*1. Purpose of the Spray
The spraying team used the DJI Agras T20 to control thrips and take care of flowering for pepper plants. The purpose is to help stamp out the thrips epidemic quickly, and ensure that the production of pepper is successful.
*2. Info of the Environment
| Date of Spray | May 12th, 2021 | Location | Dak Nong district |
| Type of Terrain | Hill and mountain | Temperature (℃) | 28oC |
| Total sprayed Area(ha.) | 28 ha | Humidity | N/A |
| Wind speed(m/s) | 3-7km/h | Wind direction | N/A |
*3. Operation Parameters
| Type of Drone | DJI Agras T20 | Firmware Version | 0023 |
| Operation mode | Route plan–Effective | Operation Speed | 4m/s |
| Operation height(from the top of the crop) | 2.5-3m | Line spacing/width/ | 5-6m |
| Liquid amount sprayed per hectare (or per MU) | 40 lit | Nozzle type | RX110015VS |
The above parameter helps the drug to be sprayed evenly from the top down because the pepper tree has a cylindrical shape, and the slow flight speed helps the propeller blow the chemicals down to the base of the pepper. The foliage of pepper is thick from the top down in a cylindrical shape, so we set the spray width as 5-6m and the speed is 4m/s to help the propeller blow the chemicals down to the base of the pepper. Plants absorb nutrients on leaves faster and more efficiently.
Before spraying:
After spraying:
*4. Info of Chemicals
| Chemical commercial name | Formulation | Active ingredient and the percentage | Chemical amount(g or ml) used per hectare |
| RONALDO | Buprofezin: 90g/l + Dinotefuran 10 g/l + Isoprocarb 400g/l | 0.5kg/ha | |
| Calcimax B Fertilizer | Boron (B): 2000 ppm, Zinc (Zn):210 ppm, Iron (Fe): 500 ppm, Nitrogen (N) 2,5%, Calci (Ca) 4.0%, pHH2O 5,7 | 3.0 lit/ha | |
| Senca Fertilizer | Protein (Nts): 11%Magnesium (MgO): 16%Humidity: 1% | 1kg/ha |
*5. Briefly compare the difference between drone, manual, and other traditional equipment in this case
Pepper is a tall plant which is hard for the traditional spraying method to spray, with not only the human body comes into direct exposure with the drug but the drug also residue will accumulate in the soil. Using drones to spray pesticides solved the above influence.
*6. Conclusion
Before using DJI Agras T20, the owner doubted the effectiveness of the drones. But after 15 days of following the results, the pepper garden simultaneously flowered and bloomed regularly. Garden owners are quite satisfied with the effectiveness of using drones.