Authors

Abstract

To achieve precise fertilisation and improve fertiliser utilisation, an eccentric intermittent spot fertilisation device was designed in this study. The device can concentrate the continuous fertiliser flow from the fertiliser discharger into intermittently discharged fertiliser clusters, and accelerate the discharge of fertiliser into the fertiliser furrow through a Geneva mechanism. Full factorial experiments based on DEM-MBD coupled simulation show that both travel speed of implement and fertiliser discharge mass had a significant effect on the degree of dispersion and the coefficient of variation (CV) of fertiliser discharge. When the travel speed was 2.5 m/s and the fertiliser discharge mass was 6 g, the device had the best performance (degree of dispersion was 5.57 and the CV of fertiliser discharge was 3.27%). The results of the soil bin verification experiment indicate that the fertiliser pile length was 81.9 mm and the CV of fertiliser discharge was 4.30% under the optimum combination of working parameters. The absolute error between this result and the simulation result was 0.04 and 1.03%. This study shows that the device has better performance under the optimal working parameters.

Abstract in Chinese

为了实现精准施肥并提高肥料利用率，本研究设计了一种偏心间歇式点施肥装置。该装置可将排肥器连续输出的肥料流集中成间歇输出的肥料团，并通过槽轮机构加速肥料排入肥沟。基于DEM-MBD耦合仿真的全因子试验表明，机具行进速度和单次排肥量对肥料离散程度和排肥量变异系数均有显著影响。当行进速度为2.5 m/s且肥料排放量为6 g时，该装置表现最佳（离散度为5.57，排肥量变异系数为3.27%）。土槽验证试验结果表明，在最佳工作参数组合下，肥料堆长度为81.9 mm，排肥量变异系数为4.30%。该结果与仿真结果的绝对误差分别为0.04和1.03%。本研究表明，偏心间歇点施肥装置在最佳参数下具有更优的性能。