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

ABSTRACT

MCP (monocalcium phosphate monohydrate), MCP + NH₄Cl, and MCP + KCl pellets were reacted with a Nicollet soil for 2 weeks. The soil was sampled at various distances from the pellet, analyzed for chemical constituents, and used in plant growth studies. Results of chemical determinations showed that pH was reduced in the zone 0 to 3 cm. from the MCP alone pellet. With MCP plus either NH₄Cl or KCl the pH was lower than with MCP alone in all samples 0 to 7 cm from the pellet. Calcium diffused 2 to 3 cm from MCP pellets, but the addition of either NH₄Cl or KCl increased calcium diffusion to 7 cm. Phosphorus did not move more than 4 cm regardless of whether NH₄Cl or KCl was added with MCP. Results of plant growth studies showed that plant roots would grow to within 2, 6, and 8 cm of MCP, MCP + KCl, and MCP + NH₄Cl pellets, respectively.

¹ Paper No. 5623 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.