土壤的物理参数是影响作物最大生产量的重要因素。因此,有必要了解土壤的诸参数中哪些直接影响作物的生产。现将其列于表1。没有水,植物不能生长,但是重要的物理参数不是水分含量而是土水势。水势与土壤吸水分的能量有关。水势也与水分从土壤移动(例如植物根从土壤中吸收水分)所需要的能量有关。不同的土壤类型使其水势相同,可土壤水分含量却不同。张力计可以直接测量小于 Soil physical parameters are important factors affecting the maximum crop yield. Therefore, it is necessary to understand which of the soil parameters directly affect crop production. It is listed in Table 1. Without water, plants can not grow, but important physical parameters are not soil moisture but soil water potential. Water potential is related to the energy absorbed by the soil. Water potential is also related to the amount of energy required to move water away from the soil (eg, plant roots absorb moisture from the soil). Different soil types make it the same water potential, but soil moisture content is different. Tension meter can be measured directly less than