disk 7 cm in diameter was placed in each of several 100 u00d7 15 mm plastic petri dishes one ml of each of the hydrolysate dilutions was then distributed uniformly onto the filter paper disks then ten perennial ryegrass seeds were distributed uniformly on top of each filter paper disk the petri dishes were covered sealed with parafilm and allowed to stand at about 23 u00b0 c for 14 days a control sample was prepared in the same manner except one ml of water was used after 14 days the length of the individual roots of each seed were determined and the average of the seven longest roots calculated this value was expressed as a percent of the average root length of the control these results are shown in table viii below table viii______________________________________the effects of acid hydrolysates of corn gluten meal ah 1 and corn gluten hydrolysate ah 2 and cgh on theestablishment of perennial ryegrassapplication level of control root length mg dm sup 2 ah 1 ah 2 cgh______________________________________2 6 68 50 425 2 0 0 010 4 0 0 0______________________________________ as the results show cgh appears to be slightly more effective in inhibiting root formation than either ah 1 or ah 2 but all hydrolysates completely inhibited root growth at 5 2 mg dm 2 and above these results further demonstrate that acid treatment can also be used to solubilize the herbicide activity in plant proteins those skilled in the art would realize that other acids i e hydrochloric sulfuric etc under the appropriate conditions could be employed as well as phosphoric acid to solubilize the herbicide activity in plant proteins soy hydrolysate and extracts obtained by the fractionation of soy hydrolysate with an absorptive resin amberlite xad 16 manufactured by.