Siahaan, Aditya Johandry, Irsal, and Bintang Sitorus. 2024. “The Relationship Between Climate and Productivity of Tea Plants (Camellia Sinensis L.) in Bah-Butong Gardens PT. Perkebunan Nusantara IV, North Sumatra Province in 2005-2009.”. Jurnal Online Pertanian Tropik 11 (2):1-8. https://doi.org/10.32734/jopt.v11i2.17559.