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Influence of Alfalfa Green Manure on the Availability of Phosphorus to Corn¹

ABSTRACT

Greenhouse work was conducted in which alfalfa and KH₂PO₄, singly and in combination, were used as phosphate fertilizers. These materials were layered into pots of Wooster silt loam representing three levels of residual phosphorus. The availability to corn of the phosphorus in these carriers of phosphorus and in the soil was measured by the use of radiotracer techniques. A series of Neubauer tests were carried out to determine the time rate of release of phosphorus from alfalfa.

Results indicate that the phosphorus in the alfalfa was not as available as in the KH₂PO₄. However, the alfalfa increased the availability of the residual phosphorus. The Neubauer tests indicated that the phosphorus from the alfalfa was most available during the period between 46 and 64 days after being incorporated into these soils.

¹ Contribution from the Department of Agronomy, Ohio Agricultural Experiment Station, Journal paper number 56-52. Presented before Division IV, Soil Science Society of America, Cincinnati, Ohio, November 20, 1952.

² Former Graduate Assistant, now Assistant Professor, University of Maine, Assistant Professor, and Professor, Ohio Agricultural Experiment Station and Ohio State University.

Received for publication November 28, 1952.