Titlebook: Supplemental Irrigation in the Near East and North Africa; Proceedings of a Wor E. R. Perrier,A. B. Salkini,C. F. Ward Conference proceedin

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Introduction,ce fresh water that evaporates into the atmosphere. Eventually this is returned as rain, 75% of which falls directly into the sea. Except for insignificant amounts obtained through desalination, the sea has never been tapped as a source for fresh water. Another resource which has not been adequately

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Regional Application of Water Balance Methods,and enrich their realm of subsistence living. To achieve these objectives, this chapter emphasizes 4 categories of data management, each with increasing precision of measurement and sophistication of technique: rainfall plus evaporation; water balance calculations; systems simulation; and, probabili

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Movement of Water in Soils,lic rewetting when roots need water, otherwise there will be a reduction in plant growth and a decline in production. The total water potential may be defined in terms of energy levels of soil water:.. =.. + .. +.. + .. + .. +..+..+..where M is the matric potential, g is the gravitational potential

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Soil Water Measurement, repeated weighings which all entail inherent error. Other techniques such as the neutron probe have come into vogue because the gravimetric method is so laborious and time consuming. Water content determination by the gravimetric method means collecting and weighing a moist soil sample, removing th

Increment

Infiltration, on the infiltration capacity of the soil. If the process is not fully considered, runoff or poor distribution of water in the soil profile can result with the possibility of water loss through deep percolation. Knowledge of the infiltration characteristics of a soil is basic information required fo