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Water capacity of soil
1. 12. AvailableWater Capacity (AWC)
a) Field capacity:The amount of water the soil can hold againstthe flow of gravity
(1/3 bar or 33 kPa). (Also see Unit 1.5, Irrigation:Principles and Practices.)
b) Wiltingpoint:The moisture level at which the soil can no longer providemoisture
for plantgrowth. (15 bar or 1500 kPa)
c) Measurement (inches/inch or inches/foot)
d) Properties influencingwater-holdingcapacity
i.Texture
ii.Salts
iii.Organicmatter
iv.Compaction
v. Soil depth
vi.Coarse fragments
vii.EstimatingAWC