الفهرس 
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Abstract
Fifty six soil profiles were collected from 28 sites of the different Dakahlia Governorate soils, to represents the different types of Dakahlian soils. These soils were collected to achieve the main objectives of this study, i.e. evaluation of status and forms of phosphorus in the investigated soils. The obtained results can be summarized as follow:-
1. Mechanical and chemical analysis:
a. The texture classes of these soils were clayey, silt clay, clayey loam and loam. The differences in calcium carbonate and organic matter are not very significant. But, there are an appreciable differences in EC values of
soil samples No. 17, 21, 23, 24, 29, 30, 33, 34, 36, 36, 37, 41, 44, 46, 47, 49 and 53, respectively, which are more than 4 dsm-1 with ESP less than 15%.
Therefore, these aforementioned soils considered sa lt affected soils. Whereas, the other investigated soil.
2. The results also, showed that total iron content is dominant followed by the total aluminum content, calcium, magnesium, sodium and the lowest was potassium.
3. The total soil-P generally decreased with depth in all the investigated soils and increased with increasing clay and/or organic matter percentages. It ranged between 412.50 to 775.00 mg P/kg soil. Most of the total soil-P exist in the inorganic form Ii.e. 77-95% of total soil-P). The correlation coefficients between total soil-P and each of clay, silt and organic matter contents were Ir1 = 0.64, r2= 0.61 and r3= 0.56), respectively. Also, available soil-P values decreased with depth, and its mean values in the studied soils were 19.70,
8.30 and 4.60 mg P/kg soil for 0-30, 30-60 and 60-90 cm, respectively.