ABSORPTION, TRANSLOCATION, AND METABOLISM OF AC-263,222 IN PEANUT (ARACHIS-HYPOGAEA), SOYBEAN (GLYCINE-MAX), AND SELECTED WEEDS

The C-14-AC 263,222 was foliar applied to common cocklebur, johnsongra ss, peanut, sicklepod, and soybean in order to study translocation and metabolism characteristics in each species. Differential absorption o f C-14-AC 263,222 between species was evident 4 h after application. A t 48 h after application, sicklepod and peanut absorbed more C-14-AC 2 63,222 than johnsongrass, common cocklebur, or soybean. Translocation of C-14-AC 263,222 and its metabolites out of the treated leaves incre ased with time for all species. The C-14-AC 263,222 and its metabolite s appear to be both xylem- and phloem-mobile based on patterns of move ment. Absorption and translocation differences occurred between specie s; however, they did not appear to explain differential species respon se. Metabolism of C-14-AC 263,222 differed greatly among species. Comm on cocklebur metabolized less C-14-AC 263,222 than any other species 9 6 h after application. Johnsongrass and sicklepod metabolized 24 and 2 8% of the C-14-AC 263,222, respectively, 96 h after application. Peanu t and soybean metabolized 76 and 62%, respectively, of the C-14-AC 263 ,222 96 h after treatment. The half-life of C-14-AC 263,222 was 1.1, 2 .5, 7.7, 11.6, and 34.5 d in peanut, soybean, sicklepod, johnsongrass, and common cocklebur, respectively. Differential tolerance of species appears to be directly related to the half-life of AC 263,222 in the plant.