The SBE was co-composted with some agricultural and palm oil milling by-products. Composted SBE has a positive impact on soil physical attributes for plant growth and microbial rejuvenation due to adequate amounts of beneficial mineral elements; improved organic carbon (OC); cation exchange capacity (CEC); water-holding capacity and C:N ratio. The pot and field trials carried out indicate highly significant increases in the productivity of okra (Abelmoschus esculentus), kangkung (Ipomoea aquatic) and groundnut magenta with 2-fold increases (35–60%) on average in fresh and dry matters production.