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This article in SSSAJ

  1. Vol. 57 No. 5, p. 1368-1374
     
    Received: July 24, 1992
    Published: Sept, 1993


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doi:10.2136/sssaj1993.03615995005700050034x

Solubility and Cation Exchange in Phosphate Rock and Saturated Clinoptilolite Mixtures

  1. E. R. Allen ,
  2. L. R. Hossner,
  3. D. W. Ming and
  4. D. L. Henninger
  1. Dep. of Agronomy, Oklahoma State Univ., Stillwater, OK 74078
    Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77840
    NASA Johnson Space Center, Houston, TX 77058

Abstract

Abstract

Mixtures of zeolite and phosphate rock (PR) have the potential to provide slow-release fertilization of plants in synthetic soils by dissolution and ion-exchange reactions. This study was conducted to examine solubility and cation-exchange relationships in mixtures of PR and NH4- and K-saturated clinoptilolite (Cp). Batch-equilibration experiments were designed to investigate the effect of PR source, the proportion of exchangeable K and NH4, and the Cp to PR ratio on solution N, P, K, and Ca concentrations. The dissolution and cation-exchange reactions that occurred after mixing NH4- and K-saturated Cp with PR increased the solubility of the PR and simultaneously released NH4 and K into solution. The more reactive North Carolina (NC) PR rendered higher solution concentrations of NH4 and K when mixed with Cp than did Tennessee (TN) PR. Solution P concentrations for the Cp-NC PR mixture and the Cp-TN PR mixture were similar. Solution concentrations of N, P, K, and Ca and the ratios of these nutrients in solution varied predictably with the type of PR, the Cp/PR ratio, and the proportions of exchangeable K and NH4 on the Cp. Our research indicated that slow-release fertilization using Cp/PR media may provide adequate levels of N, P, and K to support plant growth. Solution Ca concentrations were lower than optimum for plant growth.

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