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Phosphate—Ammonium—Moisture Relationships in Soils: II. Ion Concentrations in Leached Fertilizer Zones and Effects on Plants¹

ABSTRACT

Radioactive fertilizer pellets MCP³², MCP³² + NH₄Cl, and MCP³² + KCl were placed in a Dakota sandy loam and allowed to react for 2 weeks. The pots containing the fertilizer were then leached with 0, 2, 4, and 8 cm of water. Corn (Zea mays) was grown on these pots for 2 weeks and analyzed for total and radioactive P. Results showed only trace amounts of fertilizer P taken up from all nonleached pots. Leaching the pots with 2 or more centimeter of water resulted in a significant uptake of fertilizer P. When the pots were leached with 4 cm of water, P uptake from MCP + NH₄Cl pellets was nearly 3-fold that of either MCP or MCP + KCl. Measurement of water-soluble P and other conditions in the fertilizer zone indicated no differences between MCP + NH₄Cl and MCP + KCl pellet zones. It was concluded that ammonium increased the capacity of the plant to absorb P and did not affect the availability of P in the soil.

¹ Paper No. 5624 Scientific Journal Series, Minnesota Agr. Exp. Sta., University of Minnesota, St. Paul.

² Formerly Research Assistant, now Research Agronomist IMC, Skokie, Ill., and Professor of Soils, respectively.

Received for publication June 4, 1965. Accepted for publication August 20, 1965.