Record Display for the EPA National Library Catalog


Main Title Effects of Ozone and Sulfur Dioxide on Yield of Red Clover and Timothy.
Author Kohut, R. J. ; Laurence, J. A. ; Amundson, R. G. ;
CORP Author Boyce Thompson Inst. for Plant Research, Ithaca, NY.;Corvallis Environmental Research Lab., OR.;Electric Power Research Inst., Palo Alto, CA.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/400;
Stock Number PB90-100611
Additional Subjects Ozone ; Sulfur dioxide ; Forage crops ; Yield ; Plant growth ; Reprints ; Red clover ; Timothy ; Air pollution effects(Plants) ; Trifolium pratense ; Dose response relationships
Library Call Number Additional Info Location Last
NTIS  PB90-100611 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
A two-year study was conducted to evaluate the effects of O3 and SO2, both alone and in combination, on the yield and quality of a mixed crop of red clover and timothy. Sulfur dioxide had no effect on yield and there were no interactions between the pollutants. In the first year of the study, exposure to increasing concentrations of O3 led to reductions in yield primarily through reductions in the yield of red clover; there was little effect on the growth of timothy. In the second year, red clover had become less prevalent in the stand and O3 had no impact on total yield since the stand was dominated by the more O3-resistant timothy. In summary, the effect of O3 on the yield of the stand of mixed forage was not only a function of the concentration of the pollutant, but also of the relative O3-sensitivity and contribution to the stand for each species. Evaluations of crop quality indicated that with the exception of an increase in foliar sulfur, none of the treatments altered the variables assessed.