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Pyro‐Chemiluminescent Differentiation of Oxidized and Reduced N Forms Evolved from Plant Foliage 1
Author(s) -
Weiland R. T.,
Stutte C. A.
Publication year - 1979
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1979.0011183x011200190027x
Subject(s) - transpiration , amaranth , biology , glycine , canopy , nitrogen , fiber crop , horticulture , gossypium hirsutum , botany , cultivar , glycine soja , agronomy , photosynthesis , chemistry , amino acid , biochemistry , organic chemistry
Evaluations were made to differentiate the forms of water soluble, non‐elemental nitrogen lost with the trans. piration water vapors from plant foliage. Chemiluminescent detection of chemically bound N, with O 2 present as a reactant‐carrier gas, and then absent and replaced with N 2 during the pyrolysis of transpiration samples, distinguished the oxidized from the reduced N forms in the transpirate. The majority of the N in several crop and weed species was in the reduced state; however, at least 5% of the N in all species tested was in an oxidized form. The percent of loss of oxidized N was fairly constant in cotton ( Gossypium hirsutum L.), ‘Forrest’ beans [ Glycine max (L) Merr.], and palmer amaranth [ Amaranthus palmeri (S.) Wats.] over the solar day. Older soybean leaf tissue lost a higher percentage of oxidized forms than did younger tissue. Both younger and older soybean tissue evolved greater total amounts of N than foliage in the middle of the plant canopy; yet the rate of transpiration was maximal in the middle foliage. Water‐stressed soybeans evolved greater quantities of oxidized N forms than did irrigated soybeans. The N loss increased in ‘Davis’ soybeans and transpiration decreased in the cultivar ‘Forrest’ as a result of water stress.