Articles
Analysis of droplet deposition characteristics of multi-channel air-assisted orchard sprayer based on simulated target
Article number
1447_20
Pages
167 – 176
Language
English
Abstract
Pests are an important factor affecting yield and quality of litchi.
Improving the effectiveness of pest control in litchi orchards plays an important role in improving the yield and quality of litchi.
At present, China’s plant protection mechanization level is low, still dominated by backpack manual or electric sprayers, characterized by large sized droplets which are easy to sink and difficult to adhere to the plant organs, and thus unsatisfactory operational results.
In response to the above problems, this study designed a multi-channel sprayer for orchards, aiming to improve operational efficiency and spray quality in standard orchards.
To reveal the pattern of droplet deposition during multi-channel sprayer operation, tests were carried out using a simulated target for different wind cylinder vertical spacing, outlet wind speed and spray pressure conditions.
The test results showed that the distribution of droplets on the vertical section was not affected by changes in spray pressure and the outlet wind speed.
Increasing the peak area of droplet deposition increased the ground loss of droplets and the peak area of ground loss coincided with the peak area of deposition to the target.
When the outlet wind speed was 12 m s‑1, the sampling distance was 100 cm, and the sampling height was 124.5 cm, the coverage rate of fog drops at this point was 62.4%, and good operation effect was achieved.
During the actual spraying operation, the spraying pressure, outlet wind speed and vertical spacing of the wind cylinder were adjusted according to the thickness of the fruit tree canopy and the sparseness of the inner and outer leaves of the canopy.
The distribution of the droplets was adapted to the canopy characteristics of the fruit trees, improving the uniformity of droplet deposition in the canopy.
Improving the effectiveness of pest control in litchi orchards plays an important role in improving the yield and quality of litchi.
At present, China’s plant protection mechanization level is low, still dominated by backpack manual or electric sprayers, characterized by large sized droplets which are easy to sink and difficult to adhere to the plant organs, and thus unsatisfactory operational results.
In response to the above problems, this study designed a multi-channel sprayer for orchards, aiming to improve operational efficiency and spray quality in standard orchards.
To reveal the pattern of droplet deposition during multi-channel sprayer operation, tests were carried out using a simulated target for different wind cylinder vertical spacing, outlet wind speed and spray pressure conditions.
The test results showed that the distribution of droplets on the vertical section was not affected by changes in spray pressure and the outlet wind speed.
Increasing the peak area of droplet deposition increased the ground loss of droplets and the peak area of ground loss coincided with the peak area of deposition to the target.
When the outlet wind speed was 12 m s‑1, the sampling distance was 100 cm, and the sampling height was 124.5 cm, the coverage rate of fog drops at this point was 62.4%, and good operation effect was achieved.
During the actual spraying operation, the spraying pressure, outlet wind speed and vertical spacing of the wind cylinder were adjusted according to the thickness of the fruit tree canopy and the sparseness of the inner and outer leaves of the canopy.
The distribution of the droplets was adapted to the canopy characteristics of the fruit trees, improving the uniformity of droplet deposition in the canopy.
Authors
M. He, L. Xun, Z. Li, B. Xiao, G. Huang
Keywords
multi-channel, air-assisted spraying, simulated targets, droplet deposition
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