Figure 1.

(a) Exploded view of H-pot construction, showing location of large nurse plants, small bioassay plant, the hole where imazamox was introduced to the soil (indicated by droplet symbols), and the four layers of mesh separating pot halves. (b) Experimental design, with solid steel plates indicating that soil was packed into the perforations in the steel plate, while open steel plates were left open creating an air gap. Arrows indicate that plates were moved daily.