“Growth and Yield of Hydroponic Pak Choy (Brassica Rapa Subsp. Chinensis L) under Organic-Derived Nutrient Sources from Vetiver Biochar and Liquid Pineapple Waste”. Journal of Tropical Resources and Sustainable Science (JTRSS) 14, no. 1 (March 31, 2026): 151–157. Accessed April 9, 2026. https://journal.umk.edu.my/index.php/jtrss/article/view/2167.