الفهرس 
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Abstract
This study has been carried out in the soil science department faculty of agriculture, minia university the objectives of this are (i) to find out a simple way to increase the solubility of Egyptian rock. (ii) to study the effect of this material on the solubility and availability of phosphorus released.(iii) to measure to what extent hat p released could be absorbed by bean plant grown in five studied soil.
The investigated soils were sandy, sandy calcareous clay, clay saline and clay saline sodic soil. Rock phosphate samples were collected from three districts throughout Egypt (New valley, aswan, and EL-bahr EL-ahram governorates ) which were known to have phosphate deposits. Calcium super phosphate (c.s.p) was used as standard phosphorus source.