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Main Title Injury and Yield Response of Soybean to Chronic Doses of Ozone and Soil Moisture Deficit (Journal Version).
Author Heagle, A. S. ; Flagler, R. B. ; Patterson, R. P. ; Lesser, W. M. ; Shafer, S. T. ;
CORP Author Agricultural Research Service, Beltsville, MD. ;North Carolina State Univ. at Raleigh.;Corvallis Environmental Research Lab., OR.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/467;
Stock Number PB89-144422
Additional Subjects Ozone ; Stress(Physiology) ; Droughts ; Soybean plants ; Injuries ; Yield ; Forecasting ; Tables(Data) ; Exposure ; Field tests ; Reprints ; Dose-response relationships ; Air pollution effects(Plants) ; Glycine max
Library Call Number Additional Info Location Last
NTIS  PB89-144422 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
A 2-yr field study was performed to determine injury and yield response of soybean to long-term O3 exposure and soil moisture deficit. Two levels of soil moisture (well-watered (WW) and water-stressed (WS)) were obtained by differential irrigating during periods of low precipitation. Open-top field chambers were used to expose plants to different levels of O3 for 109 days. The 1983 season was drier and hotter than the 1984 season. In 1983, plants in the (WS) plots were under moderate to severe moisture stress and yielded approximately half as much as those in the (WW) plots. In 1984, plants in the WS plots were under moderate moisture stress during flowering and pod-fill stages and they yielded 20% less than those in the WW plots. In 1983, there was a significant relationship between O3 concentration and yield in the WW plots, but not in the WS plots. In 1984, similar linear responses to O3 occurred at both levels of soil moisture. Compared to the control, predicted yield loss for WW plots at ambient O3 levels (2-yr 7 h per day mean of 0.054 microliters/liter) was 12% in 1983 and 14% in 1984. The predicted loss value for the WS plants in 1984 was 12%.