الفهرس | Only 14 pages are availabe for public view |
Abstract The current investigation was conducted to study some soil - water relationships that are expected to be of great concern in constructing the irrigation and drainage systems of some newly reclaimed soils in Egypt. The study was carried out on ninteen profiles representing alluvial t calcareous and sandy soils of Kafr EI Sheilek Governorate andEI _ Noubaria (Nobaseed) . area and an eria behined Cairo - Alexandria Dwsert Rood t respectively. Statistical analyses were used as tools in evaluating Significancy of correlations between some physical and chemical properties with the amount of moisture retained by soils at the differant soil moisture constants under study t i. e. maximum retentive capacity t field capacity and Permanent wilting percentage . Also , the effects of the different soil properties on the amounts of available water as well as the saturated hydraulic conductivity in each of the investigated soils were objects of the current study . The results of this study can be sumanarized in the following : (1) The investigated alluvial soils could be divided according to 88 their EC , pH and ESP. into saline, saline - sodie and sodie soils . (2) According to their total prrosities the soils are arranged descendingly as follows: The alluvial> the calcareous> the sandy . (3) The alluvial soils showed percentages of fine capillary pores > water holding pores> volume of drainable pores . However in the calcareous soils the percentages of the fine capillary pores , water holding pores and volume drainable pores were very close to each other . In the sandy soils , the percentages of the volume of drainable pores were more than those of water holding pores whereas those of the fme capillary pores were the least. (4) The alluvial soils have the highest contents of the water stable aggregates, the sandy soils showed the lowest contants and the calcareous soils exhibited intermediate ones . (5) The alluvial soils retained more moisture, at the different moisture constants than the calcareous soils whose retalned moisture exceeded that retained by the sandy soils . |