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The Effect of Phosphorus Source on the Movement and Uptake of Band Applied Manganese¹

ABSTRACT

Plant uptake of band-applied Mn from a Selma silt loam soil (pH 7.0) was enhanced by blending MnSO₄·H₂O with each of four P sources in growth chamber tests. The relative value of ammonium polyphosphate (APP), monoammonium phosphate (MAP), diammonium phosphate (DAP), and monocalcium phosphate (MCP) in increasing Mn uptake by soybeans (Glycine max ‘Hawkeye’) was MAP = APP>>MCP = DAP. There was a highly significant correlation between the plant concentration of Mn and P. Plant uptake of Mn was greatest when the pH of the P source was between 2 and 4. The amount of Mn which was absorbed per increment of P varied with the P source. In this experiment APP = MAP > MCP > DAP.

Manganese movement and recovery (measured as exchangeable plus easily reducible) as influenced by P source decreased in the order: APP > MAP > MCP>>DAP. Manganese movement from phosphate mixtures was not detected when the soil pH was greater than 5.8.

¹ Contribution from Res. and Develop. Div., Int. Minerals and Chemical Corp., Libertyville, Ill.

² Research Agronomists, Agricultural Research.

Received for publication June 19, 1967. Accepted for publication September 7, 1967.