2 emulsifiable liquid concentrate in a 24 1 ratio with the antidote n n diallyl 2 2 dichloroacetamide was employed where the thiocarbamate was s propyl n n dipropylthiocarbamate the soil was pretreated with an emulsifiable liquid concentrate of the herbicide alone in each instance the emulsifiable liquid concentrates were diluted in 200 ml of water such that the resulting concentration of herbicide in the solution was 2000 mg l two hundred ml of this solution was then added to 200 lb 90 8 kg of soil to which 17 17 17 fertilizer n p 2 o 5 k 2 o on a weight basis had been previously added to a concentration of 50 ppm by weight with respect to the soil the mixture was mixed in a rotary mixer for 10 to 30 minutes the soil was then placed in round plastic containers 7 5 inches 19 0 cm in diameter by 7 5 inches 19 0 cm deep the soil was tamped and leveled with a row marker to impress one row across the width of each container this row was seeded with watergrass echinochloa crusgalli sufficient seeds were planted to produce several seedlings the containers were then placed in a greenhouse maintained at 20 u00b0 c to 30 u00b0 c and watered daily by sprinkler five weeks after treatment the soil was allowed to dry out and the plant foliage was removed the soil was then passed through a 0 25 inch 0 64 cm screen to remove plant roots and clods the soil was then treated according to the procedure of b below the soil pre treated with s propyl n n dipropyl thiocarbamate.