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This article in SSSAJ

  1. Vol. 30 No. 1, p. 39-43
    Received: June 4, 1965
    Accepted: Aug 20, 1965

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

  1. R. W. Blanchar and
  2. A. C. Caldwell2



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.

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