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This article in SSSAJ

  1. Vol. 26 No. 6, p. 584-587
     
    Received: Feb 5, 1962
    Published: Nov, 1962


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doi:10.2136/sssaj1962.03615995002600060020x

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

Abstract

Abstract

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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