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Gaseous Nitrogen Loss from Soybean Foliage 1
Author(s) -
Stutte C. A.,
Weiland R. T.,
Blem A. R.
Publication year - 1979
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1979.00021962007100010024x
Subject(s) - transpiration , point of delivery , nitrogen , cultivar , glycine , agronomy , chemistry , field experiment , elemental analysis , horticulture , biology , photosynthesis , amino acid , biochemistry , organic chemistry
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 condensate 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.