Full Text
(104 K)

Ozone Affects Competition between Cotton and Nutsedge

D.A. Grantz and Anil Shrestha


Cotton production in the San Joaquin Valley and elsewhere is threatened by new and increasingly recalcitrant weeds, and by increasing ozone air pollution. Interactions are not well understood. In field exposure chambers with potted plants we found that plant growth was reduced in both cotton and yellow nutsedge when plants grown alone were exposed to high concentrations of ozone. When the two species are grown together the effect is compounded, particularly near ambient ozone concentrations. As tropospheric ozone levels increase, yield of cotton will be reduced due to oxidant damage and competitiveness of cotton with respect to weedy species will decline. Greater use of herbicides may result unless more ozone resistant cotton cultivars are developed.

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page

Document last modified 04/27/04