About Us | Help Videos | Contact Us | Subscriptions

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.


Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.



This article in SSSAJ

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

Request Permissions


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.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America