A FINITE ELEMENT MODEL OF TILLAGE OPERATIONS AND ITS APPLICATION
耕作的数值模型及其应用

The soil moisture and temperature are key factors to abed gemination and seedling emergence.A finite element model was developed to study the seedbed soil moisture, and temperature as affected by tillage operations based on the numerical analysis method of heat and water exchange between the atmosphere and heterogeneous soil surface developed by the author.A simulation study shows effects of different tillage operations such as level sowing,minimum tillage and ridge and furrow tillage on the seedbed moisture and temperature.The model was also used to optimize the furrow sowing in North-Weatern China. This study developed a quantitative method for the agro-ecological research based on the methodology of modeling-simulation optimization.