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This article in SSSAJ

  1. Vol. 27 No. 6, p. 656-659
     
    Received: Dec 3, 1962
    Published: Nov, 1963


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doi:10.2136/sssaj1963.03615995002700060026x

The Availability of Fertilizer Nitrogen Immobilized During Decomposition of Straw1

  1. B. A. Stewart,
  2. D. D. Johnson and
  3. L. K. Porter2

Abstract

Abstract

A greenhouse study measured the extent to which fertilizer N15 immobilized during decomposition of straw becomes available for plants. Less than one-half of the immobilized fertilizer N15 was released for plant uptake during four successive croppings in the greenhouse. The crops were beets, barley, and two of corn.

Fractionation of the soil N showed that about 75% of the N taken up by the plants was derived from the nondistillable acid-soluble N fraction. Fertilizer N15 immobilized in this fraction was utilized at a faster rate by plants than the N initially present in this fraction.

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