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This article in SSSAJ

  1. Vol. 38 No. 2, p. 322-326
     
    Received: Aug 17, 1973
    Published: Mar, 1974


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doi:10.2136/sssaj1974.03615995003800020031x

Losses of Nitrogen and Mineral Nutrients from Corn Grown in Greenhouse Pot Experiments1

  1. G. L. Terman and
  2. S. E. Allen2

Abstract

Abstract

Three greenhouse pot experiments were conducted: the first to compare rates of N as ammonium nitrate (AN) and S-coated urea products (SCU, 6 and 12% initial dissolution in water) for corn (Zea mays L.); the second to measure dissolution of SCU-5, SCU-12, and SCU-20 in uncropped soil; and the third to compare rates of N, P, and K for corn. Accumulation by and subsequent losses of nutrients from corn tops and roots at three harvest dates were measured. Significant losses of N, P, and K from corn tops or tops + roots fertilized with high rates of N as AN and SCU-12 or of P and K occurred during growth from 6 to 8 or 9 weeks. These losses were closely associated with reduction in growth rates resulting from depletion of N, P, or K under test. No appreciable nutrient losses occurred from slower growing plants fertilized with SCU-6. Three SCU products released N in uncropped cultures over a 9-week period. Leaching of nutrients from corn top growth by guttation, dew, or rain was not a factor in these experiments. Consequently, most of the losses were through the roots. Competition by growth of microorganisms stimulated by root exudates is a probable explanation.

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