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Hydrolysis and Sorption of Ortho-, Pryo-, Tripoly-, and Trimetaphosphate in 32 Midwestern Soils¹

ABSTRACT

Hydrolysis and sorption reactions of orthophosphate (OP), pyrophosphate (PP), tripolyphosphate (TPP), and trimetaphosphate (TMP) were studied in 32 Corn Belt soils. TMP hydrolyzed to TPP in 1 day in all but two soils. TPP hydrolyzed to PP and OP within 7 days in 30 of 32 soils, and 15 to 80% of the PP formed in the soil remained after 14 days. The sodium salts of OP and PP were compared as P sources for corn and found to be equal. It was concluded that under our conditions (25C), the rate of TMP, TPP, and PP hydrolysis was rapid enough so it would not limit the availability of P to plants.

TMP added to soil remained water soluble. The sorption of TPP and PP by soil was more than OP.

¹ Contribution from the Research & Development Div. of International Minerals & Chemical Corp., Libertyville, Ill.

² Formerly Research Soil Chemists. Now Associate Professor of Agronomy, University of Missouri and Assistant Professor of Soil and Crop Science Department, Texas A&M University, respectively.

Received for publication January 7, 1969. Accepted for publication March 6, 1969.