Absorption, Diffusion, and Translocation of C'4-labeled Triazine Herbicides by Peanut Leaves'

and Summary. The amount of C'4-labeled triazine herbi- cides absorbed by the upper and lower surfaces of peanut (Arachis hypogea) leaves was found to be significant with the exception of 2-methoxy-4,6-bis(isopropylamino)-s-triazine (prometone). Almost al- ways a surface active agent increased the absorption of triazine her- bicides by the leaves. The surface active agent did not play any role in diffusion of these herbicides. Among the four herbicides tested 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) and 2-methoxy-4,6-bis(isopropylamino)-s-triazine (prometone) were found to move both acropetally and basipetally, whereas 2-chloro- 4,6-bis(ethylamino)-s-triazine (simazine) and 2-chloro-4,6-bis(isopro- pylamino)-s-triazine (propazine) moved only in the acropetal direction.