| This study had four distinct objectives. The first part presents greenhouse experiments conducted to characterize the response of four weed species, namely: pitted morningglory, redroot pigweed, prickly sida, and common cocklebur to fluometuron concentrations and temperature. The weed transpiration rates, aboveground fresh and dry weights, leaf area, root fresh weight and dry weight, as well as root length were related to the fluometuron concentration. Higher amounts of growth were obtained at lower fluometuron concentrations. The weed transpiration rates were also affected by aboveground biomass, leaf area and root systems. The higher the aboveground and root biomass, the larger the leaf area and the longer the root length, the higher the transpiration rates that were observed. In general, the transpiration rates increased with decreased fluometuron concentration and with increased temperature sum or heat unit for the control, 500 and 1000 ppb fluometuron for all weed species. At temperature sums or heat units higher than 463... |
