2 1 50 Siregar, Heri Adriwan Primary Author Yenni, Yurna Primary Author Sujadi Primary Author Arif, Mohammad Primary Author Rahmadi, Hernawan Y. Primary Author mixed material 9786027539310 Medan Pusat Penelitian Kelapa Sawit 2016 createthumb_%287%29.jpg.jpg Yenni, Yurna Primary Author Suprianto, Edy Primary Author Siahaan, Donald Primary Author Rahmadi, Hernawan Y. Primary Author Erwinsyah Primary Author RAHUTOMO, SUROSO Primary Author Kurniawan, Ambar Primary Author PRASETYO, AGUS EKO Primary Author Winarna Primary Author Agustira, Muhammad Akmal Primary Author Arrasyid, M. Harfano Primary Author mixed material 9786027539402 Medan Pusat Penelitian Kelapa Sawit 2017