Definition:
Condition where the suction force of plant roots can not overcome the tension of 15 atmospheres, and the remaining water is held around the soil particles. In other words, it is the minimum amount of soil moisture required to keep a plant from permanently wilting.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
AQUASTAT. 2009. Adapted from: FAO. 2002. Irrigation Manual Volume I Module 4 – Crop Water Requirements and Irrigation Scheduling. Developed by: Andreas P. Savva and Karen Frenken. FAO, Harare