added to three pounds of soil yielded a quantity in the soil equivalent to the desired application rate expressed in pounds per acre thus 5 cc of the mixture and three pounds of sandy loam soil from keeton calif containing approximately 10 8 sand 24 8 silt and 4 4 clay by weight with an organic content of 0 9 by weight and a ph of 7 2 were placed in a rotary mixer also added was 17 17 17 fertilizer n p 2 o 5 k 2 o on a weight basis at a quantity amounting to 50 ppm be weight with respect to the soil the treated soil was then placed in aluminum flats which were 2 5 inches deep 3 5 inches wide and 7 5 inches long 6 4 x 8 9 x 19 0 cm the soil was tamped and leveled with a row marker to impress six rows across the width of the flat the test weeds were as follows ______________________________________common name scientific name______________________________________green foxtail setaria viridis l beauv barnyardgrass echinochloa crusgalli l beauv sorghum sorghum bicolor l moenchwild oats avena fatua l shattercane sorghum bicolor l moench variant of sorghum ______________________________________ dekalb xi45a corn of species zea mays l was also planted sufficient seeds.