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An Insoluble Manganese Ammonium Pyrophosphate Found in Polyphosphate Fertilizer Residues¹

ABSTRACT

Seventeen ammonium polyphosphates containing 5.0–5.8% Mn were reacted with a Selma silt loam soil. Fertilizer residues formed in this manner contained from 5 to 80% of the applied Mn. A highly significant correlation (r² = 0.92) existed between the pH of the polyphosphate fertilizer and the percent of Mn which remained in the residue. Increasing pH resulted in increasing amounts of Mn at the site of placement. There was no consistent relationship between the nonorthophosphate content of the fertilizer and Mn in the residue.

The Mn compound which preciptated in the residue was determined to be Mn₃ (NH₄)₂ (P₂O₇)₂ · 2H₂O. It was the only Mn compound detected and was present in the 13 of the 17 polyphosphate fertilizers which had a pH greater than 2.5.

¹ Contribution from Research and Development Division of International Minerals and Chemical Corp., Libertyville, Ill.

² Research Soil Chemists.

Received for publication March 13, 1968. Accepted for publication May 24, 1968.