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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

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.

¹ Contribution by the Department of Irrigation and Soil Science, University of California, Los Angeles. Parts of this paper were presented at the Western Society of Soil Science meetings in Davis, Calif., June 22, 1961 and before Div. IV, Soil Science Society of America, Saint Louis, Mo., Nov. 30, 1961. The coated fertilizers used in these studies were supplied through the courtesy of the Archer-Daniels-Midland Co.

² Associate Professor and Assistant Professor of Soil Science respectively.

Received for publication February 5, 1962. Accepted for publication July 12, 1962.