Asbur, Y.; Pulungan, R. J.; Purwaningrum, Y.; Rahayu, M. S.; Siregar, C.; Kusbiantoro, D.; Khairunnisyah, K. Improvement of Soil Chemical Properties and Growth of TM-1 Oil Palm With Combination of Inorganic-Organic Fertilizer and Asystasia Gangetica (L.) T. Anderson As Cover Crop. J. Penelitian Kelapa Sawit 2023, 31, 25-42.