| Abstrakt: |
Highlights A pressure-self-controlled water-pesticide integrated sprinkler was developed for trellis crops. The dual-flow channel design integrates both water and pesticides and allows simultaneous downward irrigation of grape roots and upward spraying of grape branches and leaves. The comprehensive scoring method was employed to evaluate the spraying performance of the water-pesticide integrated sprinkler for both irrigation and spraying modes. To ensure optimal growth of plants, including for trellis-style grape cultivation, it is essential to provide water to plant roots, branches, and leaves. Unfortunately, existing sprinkler systems are not designed to accommodate irrigation and spraying at the same time. To address this issue, a pressure-self-controlled water-pesticide integrated sprinkler was developed for trellis crops in this research. To assess the performances of irrigation and spraying modes, several factors, including the droplet diameter, droplet velocity, droplet striking kinetic energy, spray uniformity, and velocity distribution, were evaluated. Advanced measurement tools such as a two-dimensional video disdrometer (2DVD) and a particle image velocimeter (PIV) were employed to experimentally study the hydraulic features of different working modes. This study provides precise working parameters, including pressure and installation height, for the sprinkler system under different conditions. These parameters offer valuable engineering guidance. Notably, during irrigation, the sprinkler dispersed water toward the ground to irrigate the roots. Furthermore, the spray droplet diameter and velocity decreased with increasing pressure. Based on an analysis of the parameters affecting the droplet striking kinetic energy, the recommended optimal working pressure is 250 kPa. The high-pressure water produced by the sprinkler in the spraying mode effectively covered the crop leaves at an optimal working pressure of 400 kPa, as determined by the spray distribution pattern at different heights. In this study, for the water-pesticide integrated sprinkler, we recommend an installation height of 1.4 m for optimal operation. These findings could promote the practical application of this system. [ABSTRACT FROM AUTHOR] |
