Evaluation of the coverage area of sprayed droplets on citrus trees by an electrostatic sprayer attached to an unmanned industrial helicopter
2020
Masui, S. (Fruit Tree Res. Center, Shizuoka Res. Inst. Agric. (Japan)) | Yamane, S. | Nakayama, H. | Mizoguchi, T. | Kawashima, K. | Tsuchida, Y. | Nakamura, K. | Makita, E. | Kageyama, C.
To establish a pesticide spraying technology paired with an unmanned industrial helicopter in citrus orchards, we developed and evaluated an electrostatic sprayer for the purpose of improving the coverage area ratio to the three-dimensional leaf layer. The electrostatic sprayer constituted of ‘TVXK8’ nozzles and a high-voltage power supply for applying +4 kV to the electrode, with a discharge of 0.55 L/min per nozzle at a pressure of 0.3 MPa. When the pesticide was sprayed downwards from 4.7 m above the ground in an indoor facility, the electrostatic sprayer improved the coverage area ratio of the water-sensitive test papers installed 1-2 m above the ground. This sprayer was mounted on the 'Fazer-R' helicopter (Yamaha Motor Co., Ltd), and aerial application tests were performed from 3-4 m above the citrus trees to evaluate the coverage area rate. The results showed that the electrostatic spraying improved the coverage area ratio of the bottom and vertical sides of the test paper placed in the leaf layer of citrus trees. Since the other test conducted in citrus orchards did not show an improvement in the coverage area ratio by electrostatic spraying, it is considered necessary to set highly reproducible spraying conditions.
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