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This article in SSSAJ

  1. Vol. 26 No. 6, p. 584-587
    Received: Feb 5, 1962
    Accepted: July 12, 1962

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Controlled Release of Fertilizer Minerals by Incapsulating Membranes: II. Efficiency of Recovery, Influence of Soil Moisture, Mode of Application, and Other Considerations Related to Use1

  1. O. R. Lunt and
  2. J. J. Oertli2



It was shown using membrane-coated granular fertilizer, in which the membrane constituted 11 or 12.5% of the weight of the granules, that: (a) moisture levels, exceeding the range of permanent wilting percentage to field capacity in a loam soil, did not appreciably affect the rate of transfer of minerals through the membrane of coated fertilizer mixed in the soil, (b) the time for transfer of a given fraction of fertilizer through membranes is substantially extended if the fertilizer is topdressed on a soil as compared to incorporated (presumably due to intermittent drying between leachings), and (c) an efficiency of recovery ranging from about 25 to 45% was obtained from a single application, incorporated in the sand, of coated ammonium nitrate by corn during a 3-month growing period. In the latter study a sand was used containing < 1% of clay and as much as 7 feet of water passed through the root zone during the period of the study. Implications of the coating technique for controlling fertilizer availability are briefly considered.

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