Effect of Mushroom Spent Empty Fruit Bunch (FEB) Supplement on physicochemical Properties of a Biofertilizer named Organonitrofos

This research aims to elaborate characteristics of an organic fertilizer, named as “Organonitrofos”, produced from agricultural wastes supplemented with spent mushroom substrate (SMS) made from oil palm empty fruit bunch (EFB). The EFB was formerly used as straw mushroom medium. Research was carried out in two stages of experiment. In the first experiment, The SMS was taken from an experiment of mushroom production, where effect of size reduction and composting duration of EFB on the mushroom production was investigated. The SMS was mixed with other materials (1:1), which is normally used as the raw materials of Organonitrofos, and was composted. In the second experiment, the SMS was taken from other experiment of mushroom production where effect of inorganic and organic fertilizer supplements on the straw mushroom production was investigated. The second experiment was carried out using the same procedure as in the first experiment. Physicochemical property of resulted Organonitrofos was evaluated and compared to other predecessors of Organonitrofos. Results showed some noticeable changes of physicochemical properties.