الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Calcium carbonate is an important sorbent of phos¬phate in calcareous soils. The interaction involves at least two steps, adsorption and precipitation. They can
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occur consecutively and/or simultaneously, and hence, are not always distinguishable. The surface reactivity, rather than the total amount of calcium carbonate present, deter¬mines the phosphate sorption capacity of calcareous soils. In spite of the fact that phosphate sorption has been a topic of interest among soil scientists for many years, its relation to the calcium carbonate surface area is not well understood. As far as is known its possible relation to the electrokinetic properties of calcium carbonate has not been investigated. Understanding the surface proper¬ties of calcium carbonate and its specific interaction with crystal growth inhibitors which retard phosphate sorption may enable us to increase fertilizer phosphorus
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efficiency in calcareous soils.