“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”. 2024. Jurnal Online Pertanian Tropik 11 (2): 1-8. https://doi.org/10.32734/jopt.v11i2.17559.