2 1 10 Z. Poeloengan Additional Author Pusat Penelitian Kelapa Sawit (PPKS) Additional Author Kusnu Martoyo Additional Author W. Darmosarkoro, I.Y. Harahap, E. Syamsuddin Additional Author Syamsul Anwar, Dja\'far, Arsyad D. Koedadiri Additional Author Winarna, Arsyad D. Koedadiri, Edy S. Sutarta Additional Author Eka Nuryanto, Purboyo Guritno Additional Author Dja\'far, Syamsul Anwar, P. Purba Additional Author mixed material 08532141 Medan Pusat Penelitian Kelapa Sawit (PPKS) 2001 cover_warta_vol9no3.jpg Kabul Pamin Additional Author LALANG BUANA Additional Author Purboyo Guritno Additional Author DARNOKO Additional Author Condro Utomo Additional Author A.Sipayung Additional Author Akiyat Additional Author R.A.Lubis Additional Author A.R. Purba Additional Author Adlin U.Lubis Additional Author E.Syamsuddin Additional Author R.Y. Purba Additional Author Adelina Manurung Additional Author E.Manalu Additional Author P.M. Naibaho Additional Author E. Gumbira-Sa\'id Additional Author mixed material Medan Pusat Penelitian Kelapa Sawit 1994 IMG_20190131_0001.jpg