Citation:

Heggestad, H. AND V. Lesser. EFFECTS OF OZONE, SULFUR DIOXIDE, SOIL WATER DEFICIT, AND CULTIVAR ON YIELD OF SOYBEAN. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/262 (NTIS PB91144840), 1990.

Description:

The effects of ozone (O3) stress on bean yields and seed size of four soybean cultivars grown in open-top chambers in 1981, 1982, and 1983 are presented. he O3 treatments included charcoal filtered (CF) and nonfiltered (NF) air, and 0.03, 0.06. and 0.09 3, uLL -1 O3 added 7 h d-1 to NF air. he effects of SO2 in concentrations from 0.005 to 0.224 uLL -1(4 h 3d -1 5 d wk-1) from the seedling stage to maturity were studied in 1981 and 1982. n 1982 and 1983 the effects of soil moisture stress SMS) and well-watered (WW) soil conditions on the response of soybean to O3 stress were determined. The primary objective was the evaluation of 3 yr of soybean data from our site using the nonlinear Weibull and the polynomial dose-response models to relate yield responses to exposure doses. he variables also included SO2 soil moisture, and cultivar. he homogeneity of the response equations were compared to permit development of the smallest set of homogeneous equations over years. oth O3 and SO2 negatively impacted bean yields and seed size. o interactions between O3 and SO2 were indicated. ith the Weibull model, interactions between O3 and SO2 soil moisture were observed with "Forrest" in 1982 and "Williams" in 1983. ith an O3 level considered typical in soybean production areas compared to background O3 and using all data from 3 yr of experiments, the Weibull model predicted the same (15%) mean yield loss under both SMS and WW regimes.

URLs/Downloads:

Record Details:

Document IDs: