最近的研究工作证明,作物生长与土壤物理环境有密切关系。一般水稻土有水、旱两作过程,土壤随着淹水、排水和落干的变化相应地发生膨胀、分散、凝聚和收缩。水稻土的物理环境不是固定不变的。耕作形成的土壤环境是暂时的,在没有机械扰动的情况下,土壤物理环境也在自然地向适合或妨碍植物生长的状态发展,而土壤的结构特性左右 Recent research shows that crop growth is closely related to the physical environment of the soil. General paddy soil water, dry two for the process, the soil with flooding, drainage and drying changes corresponding expansion, dispersion, condensation and shrinkage. The physical environment of paddy soil is not fixed. The soil environment formed by tillage is temporary. In the absence of mechanical disturbances, the physical environment of the soil is naturally developing to a state suitable for or impeding the growth of the plant, while the structural characteristics of the soil