A great deal of effort has been directed towards the development of economically and technically feasible processes for the chemical extraction of P2O5from basic slags, which is a by-product in the manufacture of steel. Disposal of basic slag is a problem in industrial cities throughout the world. The chemical composition shows that basic slag contains many essential ingredients for plants growth. Its use as a fertilizer has, therefore, been suggested by scientists and agriculturists. But the negligible solubility of the phosphatic content of basic slag in water makes it practically ineffective as a fertilizer.