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Agronomy Journal Abstract -

Gaseous Nitrogen Loss from Soybean Foliage1

 

This article in AJ

  1. Vol. 71 No. 1, p. 95-97
     
    Received: Sept 1, 1978


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doi:10.2134/agronj1979.00021962007100010024x
  1. C. A. Stutte,
  2. R. T. Weiland and
  3. A. R. Blem2

Abstract

Abstract

The loss of non-elemental N from plant foliage was verified, and the significance of this loss was investigated. Soybean (Glycine max (L.) Merr.) leaf vapors were condensed (–50 C) using a calibrated test tube tra in a closed system. Subsequent N analysis of this congensate revealed water soluble N forms. Since the pyrochemiluminescent technique that was used for N analysis does not detect elemental N, the N present must be in chemically bound forms; preliminary research indicates the N in both oxidized and reduced forms.

Significant losses of N from the determinate cultivar ‘Davis’ were positively correlated to temperature and to transpiration rate under field conditions. These losses, which like transpiration followed a diurnal trend, were greater in early vegetative growth stages than during flowering and pod-fill. The amount of N lost is significant under the high temperatures of field Conditions and may account for much of the reduction in potential seed yields under this stress condition.

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