STUDIES ON PHOSPHATE FERTILIZERS. PART II MONOCALCIUM TETRASODIUM PHOSPHATE AND MONOCALCIUM TETRAPOTASSIUM PHOSPHATE

CENTRAL LABORATORIES FOR SCIENTIFIC & INDUSTRIAL RESEARCH, HYDERABAD-DN. (Received April 26, 1954) A product of high phosphate availability is obtained when phosphate-rock is heated with alkali carbonate and hydroxide. An ammonium citrate-soluble phosphate is formed at the melting point of the alkali which does not hydrolyse when leached with water, and conforms to the formula CaR4 (PO4)2, where R is Na or K