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RECORD NUMBER: 44 OF 56

OLS Field Name OLS Field Data
Main Title Ozone and Soil Moisture Deficit Effects on Nitrogen Metabolism of Soybean (Journal Version).
Author Flagler, R. B. ; Patterson, R. P. ; Heagle, A. S. ; Heck, W. W. ;
CORP Author Agricultural Research Service, Beltsville, MD. ;North Carolina State Univ. at Raleigh. Dept. of Botany.;Corvallis Environmental Research Lab., OR.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/464;
Stock Number PB89-144398
Additional Subjects Ozone ; Stress(Physiology) ; Droughts ; Soybean plants ; Nitrogen fixation ; Oxygen ; Soil water ; Nitrification ; Plant metabolism ; Plant physiology ; Farm crops ; Yield ; Reprints ; Dose-response relationships ; Air pollution effects(Plants) ; Glycine max ; Reductases
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NTIS  PB89-144398 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/08/1989
Collation 10p
Abstract
A two-year field study was conducted to determine the effects of soil moisture deficit and O3 on nitrogen metabolism of soybean. Nitrogen fixation, estimated by the acetylene reduction (AR) technique, was decreased by both treatments. As O3 concentration increased, there was a decrease in total AR activity and a more rapid decline of activity during reproductive growth. Water deficit decreased AR activity significantly both years. The activity of nitrate reductase (NR) was also decreased by WS treatments. Ozone effects on NR activity varied between years. Rates of N accumulation were generally lower in higher O3 and WS treatments. The partitioning of N among various plant parts and concentrations of N within plant parts were altered in WS treatments during all stages of growth and to a far lesser extent by O3 treatments during reproductive growth. There were no significant O3 X water regime interactions.