الفهرس | Only 14 pages are availabe for public view |
Abstract SUMMARY Seven profiles were taken from the area of EIQaa Plain, Sinai Peninsula. There were 34 layers identified in those profiles. The profiles were described, and field determination of the rate of water infiltration was conducted. Soil samples were ,analysed for the following : salinity, soluble cations and anions, texture, clay (c), silt (si), coarse sand (ca), fine sand (fs), caCo3, organic matter (om), cation exchange capacity (CEC), exchangeable 50duim percent (ESP), porosity including distribution of pore size. Quickly drainable pores (ODP), >28.8 u9i slowly drainable pores (SOP), 28.8 - 8.62 u¢i water-holding pores (WHP), 8.62 - 0.19 u 14; and nonuseful pores (NUP), <0.19 u~ were all determined. Field capacity·FC, and wilting point (WP), were determined and t:hedifference between them ( avai1able water ”AWl ) was calculated. Moisture retention curves relating moisture at tensiclOsof 0, 0.1, 0.33, 0.66, 1.00, and 15.00 bars were prepared. Some other properties including pH, a~d hydraulic conductivity (HC) were also determined. and Effect of soil properties on moisture infiltration were assessed llainly constants, ~y carrying HC, out - 126 - correlation analysis, relating those properties to the soil water parameters. FC and WP as well as He showed close relation with a number of soil properties i.e. fs, cs, si, c, Caco3, om, NUP, and QOP. Values of ”r’t (correlat ion coeff icient) for each water constant related with each of the above prperties, respectively, are as follows FC -0.469 **, •.*.”. 0.569 , -0.815 ***, 0.856 ***, 0.897 ***, 0.416 **, 0.934 ***, and -0.722 ** -0.841 ***, 0.892 ***, 0.948 ***, 0.500 **, 0.969 ***, and -0.605 *** 0.841 .**, -0.814 ***, -0.845 ***, -0.481 **, WP -0.485 **, 0.608 *** , He ns , -0.412 * , -0.819 ***, and -0.484 ** Available water (AW) was correlated significantly only with porosity; with r values of 0.889 ***, 0.535 **, and *** 0.602 relating to WHP, SDP, and QDP respectively. caso.• only affecbed He (r = -0.443 ** ). Infiltration rate ranged between 0.t7 to 15.20 cmlh and was greater with lighter soi Is which p05:ses more QDP. Moisture curves were smooth in heavy so i l:s• Moisture contents showed the following ranges FC .. 6.3 - 48.1’ w/w, 4.6 - 40.5% w/w, - 127 - AW 1.8 - 13.6% w/w. Hydraulic conductivity He ranged from 0.7 to 11.4 cm/h, and basic infiltration rate ranged from 0.47 to 15.2 em/h. The most important factor affecting all of the moisture parmeters and the soil-water relationship constants is porosity, particularly pore size distribution. It was the only parameter affecting AW. The indirect effect of constituentslike clay on AW was not obtained in the light of the majority of the salls being structureless. The soils were either massive of single grain; the only profile with natural peds was the clay one, with platy or subangular structure. • One profile was clay, another was a sandy clay loam over loamy sand and five were mainly sands to loamy sands. |