Optimal design and experiment of cotton defoliatorspraying equipment
In Xinjiang,cotton is cultivated using a dwarfing and close planting method,resulting in mutual leaf coverage among cotton plants.The traditional top-down spraying method using conventional sprayers is not suitable for this situation,leading to low leaf coverage and poor atomization of spray droplets at the lower parts of the plants.To address this issue,a spraying equipment suitable for cotton defoliant application has been designed.The spray bar rack of the equipment consists of two parts,horizontal bar top spray and suspension bar side spray,achieving three-directional spray application.Through indoor experiments and data analysis,an optimized parameter scheme for cotton defoliant spraying has been proposed.Specific parameters of the spraying equipment,including the height of the lateral spray bar from the ground,the height of the hanging rod from the ground,and the angle of the hanging rod spray head,were comprehensively studied using single-factor experiments.Using regression analysis and response surface methodology with Design-Expert 13 software,these parameters were optimized to obtain the best spray parameter combination.The results indicate that among these factors,the most influential to vegetation cover by spray droplets in the cotton plant canopy are,in descending order:lateral spray bar height,hanging rod height,and hanging rod spray head angle.The optimal spray parameter combination is identified as:hanging rod height of 26 cm,lateral spray bar height of 135 cm,and hanging rod spray head angle of 28°,yielding a predicted maximum vegetation cover rate of 81.45%.The defoliant spraying equipment significantly improves leaf droplet deposition compared to traditional hanging spray bar sprayers,resulting in more uniform application and meeting national standards with a cotton boll drop rate not exceeding one per 2 square meters.This study provides reference for further improvement and optimization of cotton defoliant spraying equipment parameters.
万方数据
维普
