Technique for measuring the relative movement of herbicides in soil under leaching conditions

A technique for determining the relative leaching of herbicdes in soil is described. This consists of coating a glass plate with a uniformly thin layer of soil, applying the herbicde as a streak to the bottom of the plate and then cluting it with water. This is analogous to thin‐layer chromatography. After clution, the position of the herbicide is determined by a bioassay with browntop grass (Agrostis tenuis). This provides a speedy and economical method which is particularly useful as a screen for experimental herbicides.