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ASSESSING THE IMPACTS OF SOIL MOISTURE STRESS ON REGIONAL SOYBEAN YIELD AND ITS SENSITIVITY TO OZONE (JOURNAL VERSION)
Citation:
King, D. AND W. Nelson. ASSESSING THE IMPACTS OF SOIL MOISTURE STRESS ON REGIONAL SOYBEAN YIELD AND ITS SENSITIVITY TO OZONE (JOURNAL VERSION). U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-87/469 (NTIS PB89144430), 1987.
Description:
Plants that experience moisture stress show less ozone-caused injury than non-stressed plants exposed to similar levels of ozone. To evaluate the interaction of moisture stress and ozone for soybean grown in the U.S.A., relative yields were simulated with a model to compute a general relationship between moisture stress effects on yield and crop sensitivity to ozone. In 1980 a 25% reduction in ozone would have increased mean yield by 6.0% for adequately watered soybeans, but only a 4.6% increase was predicted when moisture stress was included. This shift represents a 23% decline in sensitivity to ozone caused by moisture stress. The mean predicted ozone impact on soybean yield for 1979-1983 was reduced 19% by moisture stress. These predictions agree with drought-induced reductions in ozone sensitivity observed in pot-grown soybeans, but results from field experiments involving moisture stress are less certain.