الفهرس | Only 14 pages are availabe for public view |
Abstract Water-logging is defined as the state of land in which the subsoil water table is located at or near the surface with the result that the yield of crops commonly grown on it is reduced for the land, or if the land is not cultivated, it cannot be put to its normal use because of the high water table. Water-logging is serious problem in Egypt, because the land subjected to water logging results in reduction of agricultural production. The main objectives of this study are: 1- Study the effect of soil layer depth to impermeable layer, and soil types on water logging in agricultural lands. 2- Study the effect of irrigation systems, and crop types on water logging. This study includes a theoretical study for water-logging time and discharge with different types of soil and various Permeable layer depths by computer program (Z-soil program). An experimental model is performed using Surface Irrigation apparatus with different types of soil and various Permeable layer depths also. Verification between experimental work and theoretical study is investigated. The effect of irrigation systems such as sprinkler, trickle, and surface methods on water-logging time is investigated with different crop types, soil types, layer depth, and latitude. Design curves for Egypt area are drawn. EI-Salhiya is taken as an application of this study, because water- logging has appeared in some areas of El-Salhiya. Z-soil program is applied on El-Salhiya soil type (sand soil with 172m layer depth). Different methods of irrigation are applied on El-Salhiya with crops which are cultivated in this area, and water-logging time is calculated. |