A handbook of the World Food and Agriculture Organisation for developing the right irrigation scheme. Part I of this manual allows the reader to make a rough estimation of the crop and irrigation water needs - without using any complicated calculations. Part II of this manual allows the reader actually to calculate - be it in a fairly simple manner - the crop and irrigation water needs. These calculations obviously lead to a greater accuracy, but they also require more time and background knowledge.
FAO (1986): Irrigation Water Management: Irrigation Water Needs. Rome : Food and Agriculture Organization of the United Nations (FAO) URL [Accessed: 18.07.2012]