الفهرس 
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Abstract
Soil salinity considered one of the most critical factors controlling the
productivity of soil. The purposes of this study are to evaluate the effect of
water quality on some soil characteristics, accumulation patterns of salts
and asses of the possibility of using some of mathematical approaches for
prediction the soil salinity under different salinity conditions used.
Two type of soils (sandy and clay loam soils) were leached with five
salinity grade orders of the irrigation water (I, II, III, IV and V ).
Infiltration rate using double ring with the abovementioned saline waters
was measured for the both soils used. Soils samples were collected
horizontally at the distances of 0,22.5,45 cm from the center of the ring in
four perpendicular directions (A, B, C, D) and vertically at the depths of 0-
20, 20-40, 40-.60, 60-80, 80-100 cm for each direction. They were
collected every 12 hours from sandy soil and every 48 hours from clay loam
soil after applying saline water levels until the soit became dry. Soil
moisture content, total soluble salts and soluble sodium were determined in
the soil samples. Unsaturated hydraulic conductivity and mathematical
approaches of the salt distribution were calculated.
The obtained results are summarized as folk7Ns;
The values of instantaneOus infilb”ation rate in the tested sandy soil are
higher (0.4 mmlmin) than the clay loamy soil (0.07 mmlmin), this may be
due to the former soil contains highly drainable pores than the latter
ones.
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The values of infiltration rate ina-eased with increasing the salt level of
the tested water used in both soils.
Soil moisture content increased when soil received high salt
concentration of water either in the sandy or clay loamy soil. The
moisture content was highly affected with soil depth in sandy soil, while
the effect of time was more pronounced in the clay loamy soil.
Calculated unsaturated hydraulic conductivity increased in clay loamy
soil more than sandy soil. The calculated values of the unsaturated
hydraulic conductiVity K(Bv) of the two studied soils decreased with time
after irrigation, decreased downward with depth, but increased with
increasing salinity level of irrigation water.
The addition of different levels of saline water to the soil profile are
more deteriorate effect in sandy soif than in clay loamy soil at all salinity
levels. The accumUlation of salts in both tested soils increased in the
surface layer than in the lower layers. The values of salt accumulation
increase in sandy soil more than in clay loamy soil.
The distribution patterns in the tested soil are less homogenous in the
upper layer, while it become O1Orehomogenous in the lower depth. The
soil received irrigation water with higher salinity level contain higher
sodium concentration in the two tested soils, and sodium concentration
increased with increasing depth and the period of applying irrigation
water.