Because the grass has 45 days nepia carbon nitrogen ratio in the right (C/N = 19.33) and there is an element of high cellulose so can produce a maximum of biogas.
Due napier grass for 45 days with the proper carbon to nitrogen (C / N = 19.33) and are composed of cellulose highest. The biogas production to the maximum.
Due to Napier Grass 45 days. The ratio of carbon to nitrogen proper (C / N = 19.33) and with the elements of the cellulose as high as possible. It can produce biogas maximum.