Since the development of precision agriculture technology, precision spraying, as one of the key technologies of precision agriculture, has been an important issue studied. In order to further study precision spraying, the partition width variable spraying method based on double way control was proposed, and the pesticide precision spraying test bench was set up to measure and test the effective nozzle under the proportional solenoid valve control. The test found that the error between the effective spray amplitude and theoretical value was less than 20%, when the PWM duty ratio was greater than 60%, which had reference value. During the test, the partition width of the spray prescription map was selected according to the effective spray amplitude, and 0.5m,0.75m and 1m were used as the test parameters. Orthogonal tests with spray height, travel speed, and partition width were designed from the selected parameters, and regression equations were obtained, and the correctness of the model was tested by residual analysis. The spray height was 1.5m, travel speed 0-0.5m/s and partition width 0.7-0.9m. Field experiments showed that spraying with optimized zone width saved 23% of the dosage compared with conventional spraying, while the effective coverage could reach 90.7%.

自精准农业技术开展以来，精准喷药作为精准农业关键技术之一，是一直以来研究的重要问题。为进一步研究精准喷药，提出基于双路控制的分区宽度变量喷药方法，并搭建农药精准喷洒试验台，对比例电磁阀控制下喷头的有效喷幅进行测量试验。试验发现，在PWM占空比大于60%时有效喷幅与理论值喷幅误差小于20%，具有可参考性。试验时，根据有效喷幅对喷药处方图的分区宽度进行选择，以0.5 m、0.75 m、1 m作为试验参数。根据选择的参数设计以喷雾高度、移动速度、分区宽度为因素的正交试验，得到回归方程，并通过残差分析检验模型的正确性。试验得到参数优化区域为：喷雾高度1.5 m、行进速度0～0.5 m/s、分区宽度0.7～0.9 m。田间试验发现，采取优化的分区宽度进行喷药比常规喷药方式节省23%的药量，同时有效覆盖率可达90.7%。