Field capacity Field capacity-The amount of water remaining in a soil after the free water has been allowed to drain away (a day or two)after the root zone had been previously saturated; expressed as a ercentage
Field capacity-The amount of water remaining in a soil after the free water has been allowed to drain away (a day or two) after the root zone had been previously saturated; expressed as a percentage. Field capacity：
Capillary water rise skeTch map Soil particle Groundwater table
Soil particle Capillary water rise sketch map Groundwater table
The height of capillary water rise 3 h h(cm): the hight of capillary water rise, d: the diameter of the capillary tube (mm)
The height of capillary water rise : h（cm): the hight of capillary water rise ，d: the diameter of the capillary tube（mm）
(4) Gravitational water Gravitational water -Water which moves into through or out of the soil under the influence of gravity
（4） Gravitational water Gravitational water -Water which moves into, through, or out of the soil under the influence of gravity
二、 The express methods of soil water content (- The mass water content(0 Percntage water=<[wet soil weight)-(oven dry soil weight) (oven dry soil weight))X 100 (=) The volume water content(0. Volume water content= volume of water/bulk volume of soil(weight of water/pw)/(weight of dry soil/ pb) 0y=0m.P C Relative water content(%) Relative water content= soil water content/ field capacity
二、 The express methods of soil water content （二） The volume water content （ v） Volume water content = volume of water/bulk volume of soil=(weight of water/ρW)/(weight of dry soil/ ρb ) V =m· （一）The mass water content（m) Percntage water = {[(wet soil weight)-(oven dry soil weight)]/ (oven dry soil weight)} ×100 (三）Relative water content（%） Relative water content= soil water content/ field capacity