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Tampubolon, N.A., Muktamar, Z. and Barchia, M.F. 2023. The Effect of Eco Enzyme from Pineapple (Ananas comosus) Peel Waste on Soil pH, P Availability, Growth and Yield of Shallots (Allium cepa) in Ultisols . TERRA : Journal of Land Restoration. 6, 2 (Dec. 2023), 51–56. DOI:https://doi.org/10.31186/terra.6.2.51-56.