2 1 10 Iman Yani Harahap Primary Author Winarna Primary Author Luqman Erningpraja Primary Author Agus Eko Prasetyo Primary Author Donald Siahaan Primary Author Condro Utomo Primary Author Yusran Pangaribuan Primary Author Taufiq Caesar Hidayat Primary Author TRI HARYATI Primary Author Jenny Elisabert Primary Author Happy Widiastuti Primary Author agus su Primary Author mixed material 0853196X Medan Pusat Penelitian Kelapa Sawit 2008 jurnal_11zon.jpeg.jpeg Happy Widiastuti Primary Author mixed material Bogor IPB 2004 13116.jpg.jpg