HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Stutte, C. A. Articles by da Silva, P. R. F. Search for Related Content PubMed Articles by Stutte, C. A. Articles by da Silva, P. R. F. Agricola Articles by Stutte, C. A. Articles by da Silva, P. R. F.

Nitrogen Volatilization from Rice Leaves. I. Effects of Genotype and Air Temperature¹

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/dm² 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.

Key Words: Oryza sativa L. • Transpiration • Cultivar • Pyro-chemiluminescence • Temperature stress

² Department of Agronomy, Altheimer Laboratory, Univ. of Arkansas, Fayetteville, AR 72701.

Received for publication July 21, 1980.