This training material gives an introduction to crop water needs and discusses the influence of climate, crop type and growth stage. It also discusses how much of the crop water need can be met by rainfall and/or irrigation applications. Further, it introduces the special requirements of growing rice. Finally, it looks at the irrigation water needs within a parcel of land at the plant level.
FAO (1992): Irrigation Water Management: Training Manual No. 6 - Scheme Irrigation Water Needs and Supply. Rome: Food and Agriculture Organization (FAO) URL [Accessed: 13.12.2011]