the concentration of glucose and the concentration of other sugars including xylose and an average concentration value was calculated as the amount of glucose obtained based on 100 g of corn stover or yellow poplar powders the results are shown in table 5 below as shown in table 5 above the samples including the granulate diatomite during the pretreatment process in accordance with the present invention showed an increase in sugar yield at all of the pretreatment temperatures than the no additive samples controls 120 g of sunflower stalk of known chemical composition was introduced to a large scale reactor having a capacity of 2 000 ml parr reactor available from parr instrument co ltd u s a and 1 380 ml of distilled water was added thereto and then heated when a thermometer placed in the reactor indicated an initial temperature of 180 u00b0 c the temperature of the reactor was maintained for 40 minutes followed by rapid cooling to terminate the pretreatment reaction the pretreated materials in the reactor were homogenized and an amount equivalent to 1 g dry weight of the pretreated materials was transferred to a 125 ml erlenmeyer flask and 1 g of each of saccharification additives listed in table 6 0 1.