the rice straw segments are added into the lby liquid media containing the pmbiii strain group at the concentration of 5 w v and then the mixed solutions are cultured in shaking culture at 200 rpm under 50 u00b0 c for 0 1 4 7 and 10 days respectively each treatment is set up in four repetitions next cao is added into the fermentative culture solution at the concentration of 1 w v and then the fermentative culture solution is boiled up to 140 u00b0 c for 30 minutes for preparing the pulp solution the pulp solution is further pulped for 15 minutes the pulp solutions are sieved by sieves with 18 200 and 270 meshes respectively for isolating the incompletely decomposed rice straw pulp fibers from the pulp solutions the recovery percentages of the rice straw pulp fibers sieved through sieves with different meshes are calculated the recovered rice straw pulp fibers sieved through 200 meshes are made into the handmade papers the physical properties of the handmade papers are tested please refer to fig4 and table 3 fig4 shows the effects of different fermentation culturing periods on the recovery percentages of various straw pulp fibers the recovery percentage is decreased as the fermentation culturing period is increased the pulp fibers recovered from the fibers sieved through 200 meshes which are fermented for different fermentative periods are compared the recovery percentage of 1 day fermentative culture is higher than those of the other periods table 3 shows the effects of different fermentation culturing periods on the physical properties of handmade papers made from rice straw pulp fibers the 4 day fermentative culture has the best gas permeability and.