“Penggunaan Biostimulan Orgamin Untuk Efisiensi Pemupukan Dan Peningkatan Produktivitas Kelapa Sawit Di Dataran Tinggi Application of Orgamin Biostimulan to Enhance Fertilizer Efficiency and Productivity of Oil Palm Grown in Highland”. E-Journal Menara Perkebunan 81, no. 2 (March 7, 2016). Accessed September 17, 2026. https://mp.iribb.org/index.php/mpjurnal/article/view/37.