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Nitrogen Volatilization from Rice Leaves. I. Effects of Genotype and Air Temperature 1
Author(s) -
Stutte C. A.,
Silva P. R. F.
Publication year - 1981
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/cropsci1981.0011183x002100040030x
Subject(s) - cultivar , oryza sativa , biology , transpiration , agronomy , volatilisation , horticulture , nitrogen , ammonium , botany , chemistry , photosynthesis , biochemistry , organic chemistry , gene
Rice ( Oryza sativa L.) plants lose significant amounts of volatile N in conjunction with the transpirational water vapors. This experiment was designed to examine the patterns of volatile N loss and transpiration in a number of cultivars and to determine the influence of air temperature on this loss. Water‐soluble, nonelemental N in the transpirational condensate was analyzed by pyro‐chemiluminescence. The results indicated that marked differences in the rates of volatile N loss occurred among rice cultivars. On most sampling dates, ‘Lebonnet’ showed the lowest rate of N loss among the very short‐season cultivars, and ‘Nortai’ generally lost less N/dm 2 leaf area than the other two midseason cultivars. The increase in temperature from 30 to 35 C greatly increased the rate of volatile N loss in all cultivars tested. Within a maturity group, differences in rates of N loss among cultivars were relative to their sensitivity to temperature variations. The process of volatile N loss may constitute a defense mechanism of plants against ammonium toxicity under stress temperature.