Definition:
Three parameters have to be considered in preparing an irrigation schedule:
1)The daily crop water requirements,
2) The soil, particularly its total available moisture or, water-holding capacity
3) The effective root zone depth
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Source:
Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 1, Irrigation Development: a Multifaceted Process, By: Andreas Savva & Karen Frenken