Authors

Abstract

This study investigates the interaction mechanisms between the dibber, soil, and garlic during directional garlic seeding using the Discrete Element Method (DEM), aiming to improve planting uprightness and planting-depth consistency. A discrete element model of the garlic seeding process was established to analyze the dynamic interactions among the dibber, soil, and garlic from a microscopic perspective, and the reliability of the simulation results was verified through macroscopic experiments. The results show that dibbling depth, lifting height, dibbling speed ratio, and soil-particle surface energy are key factors influencing planting uprightness and depth consistency. Within a certain range, increasing the dibbling depth and lifting height significantly improves uprightness, although the effect diminishes beyond critical thresholds. The influence of the dibbling speed ratio on uprightness exhibits a nonlinear trend, in which both excessively low and excessively high ratios reduce uprightness. In addition, lower soil-particle surface energy leads to increased uprightness and improved soil backfilling performance. Experimental validation confirmed strong agreement between the simulation and physical test results, with an average relative error of less than 10%. This study provides a theoretical foundation and numerical simulation tools for optimizing directional garlic seeding technology, offering important guidance for improving planting uprightness and planting-depth consistency.

Abstract in Chinese

本研究基于离散元法（DEM）探究大蒜定向播种过程中取种器、土壤与蒜种之间的相互作用机制，旨在提高蒜种的种植直立度与播深一致性。通过建立大蒜播种过程的离散元模型，从微观角度分析了取种器、土壤颗粒与蒜种间的动态相互作用，并通过宏观试验验证了仿真结果的可靠性。结果表明：插播深度、提种高度、插播速比以及土壤颗粒表面能是影响大蒜种植直立度和播深一致性的关键因素。在一定范围内，增大插播深度与提种高度可显著提高直立度，但超过临界值后效果减弱；插播速比对直立度的影响呈现非线性关系，速比过低或过高均会导致直立度下降；此外，较低的土壤颗粒表面能有助于获得更高的直立度与更好的土壤回填效果。试验验证表明，仿真结果与物理试验结果具有高度一致性，平均相对误差小于10%。本研究为优化大蒜定向播种技术提供了理论基础与数值模拟工具，对提高大蒜种植的直立度与播深一致性具有重要指导意义。