Tampubolon NA, Muktamar Z, Barchia MF. 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 [Internet]. 2023 Dec. 17 [cited 2024 May 9];6(2):51-6. Available from: https://ejournal.unib.ac.id/terrajournal/article/view/30244