Authors

Abstract

Plow pan is one of the main obstacles to high production of agricultural plants in Chongqing, China. As a minimal tilling method, subsoiling can break the plow pan and help the growth of agricultural plants. There are two subsoiling methods: vibrating subsoiling (VS) and traditional subsoiling (TS). A soil model with upland field features in Chongqing was established for DEM-based simulation. The simulation was validated by field experiments, in items of soil looseness, coefficient of soil disturbance, and cross-section of tillage, the errors of the simulated and experimental values of the soil looseness and soil disturbance coefficient of TS and VS were 12.9% and 14.7%, respectively. Compared with TS, VS resulted in lower soil looseness, higher coefficient of soil disturbance, smaller width of upper furrow, and lighter damage of tillage layer, and no obvious overturn of soil blocks was observed for the VS. Compared with TS, vibration helps improve the tillage performance of subsoilers.

Abstract in Chinese

犁底层是中国重庆地区农业高产的主要障碍之一。作为一种少耕方法，深松可以打破犁底层，并有助于农业作物生长。有两种深松法：振动深松法和传统深松法。用离散元法建立了重庆地区田间土壤模型。通过田间试验，在土壤膨松度，土壤扰动系数和耕作横截面方面对仿真结果进行了验证，TS和VS后的土壤膨松度和土壤扰动系数的仿真值和实验值的误差分别为12.9％和14.7％。与传统深松相比，振动深松降低了土壤膨松度，增加了土壤扰动系数，减小了上部沟形宽度，对土壤耕作层破坏较小，地表无明显翻土。与传统深松相比，振动有助于提高深松机的耕作性能。