旱地小麦全膜覆土穴播联合机覆土作业性能试验
Performance experiment of soil mulching on plastic-film and dibble machine for dry-land wheat

为进一步提高旱地小麦全膜覆土穴播联合机覆土作业性能，以作业机前进速度、刮板式土壤升运器线速度和刮板式土壤升运器倾角为自变量，平均覆土合格率为响应值，依照Box-Behnken试验设计原理，采用三因素三水平响应面分析方法，建立各试验因素与平均覆土合格率之间的数学模型，并对各因素及其交互作用进行分析。试验结果表明：三个因素对平均覆土合格率影响的主次顺序为作业机前进速度、刮板式土壤升运器倾角和刮板式土壤升运器线速度，联合机最佳工作参数为：作业机前进速度0.55 m·s-1、刮板式土壤升运器线速度1.00 m·s-1、刮板式土壤升运器倾角40°。验证试验结果表明，联合机平均覆土合格率为98.6%，较优化前的覆土作业性能有明显提升。
For further improving the operation performance of soil mulching on plastic-film and dibble machine for dry-land wheat, taking advance velocity of the machine, linear velocity of scraper soil elevating and dip angle of scraper soil elevating as for the independent variables, the percent pass of average soil mulching as for response, according to the testing design principle of the Box-Behnken, using the analysis method of three factors and three levels, set up the mathematical model for each experiment factor with the mean percent pass of soil mulching, and carried out the analysis for each factor and interaction function. The test results showed that: The decreasing sequence of three parameters to influence the average percent pass of soil mulching were the advance velocity of machine, dip angle of scraper soil elevating and linear velocity of scraper soil elevating mechanism. The optimal working parameters of the machine were: the advance speed 0.55 m·s-1, linear velocity of scraper soil elevating 1.00 m·s-1 and dip angle of scraper soil elevating 40°. The results of confirmatory tests showed that : The average percent pass of soil mulching was 98.6%, the operation performence of soil mulching was significantly improved compared with before the optimization.