4 1 10 Pusat Penelitian Kelapa Sawit (PPKS) Additional Author SUGIYONO Additional Author Hasrul A. Hasibuan, Donald Siahaan, Frisda R. Panjaitan Additional Author Hasrul A. Hasibuan, Donald Siahaan, Meta Rivani, Frisda R. Panjaitan Additional Author Mohamad Arif, R.Y. Purba, Yabani, E. Suprianto Additional Author mixed material 08532141 Medan Pusat Penelitian Kelapa Sawit (PPKS) 2008 cover_v16no2jun08.jpg Pusat Penelitian Kelapa Sawit (PPKS) Additional Author Arsyad D. Koedadiri Additional Author SUGIYONO Additional Author Fahrida Yanti, Agus Susanto Additional Author Sebayang, E.S. Sutarta, Iman Yani Harahap Additional Author Kolem Ginting, E.S. Sutarta, R.Y. Purba Additional Author Luqman Erningpraja, A. Kurniawan, Arsyad D. Koedadiri Additional Author Eka Nuryanto, Diah Sri Arisanti Additional Author mixed material 08532141 Medan Pusat Penelitian Kelapa Sawit (PPKS) 2004 cover_warta_vol12no14.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 T.L. Tobing Additional Author Kusnu Martoyo Additional Author Suwandi Additional Author R. Sukarji Additional Author O.S. Dharmaputra Additional Author A.L. Abadi Additional Author W.P. Suwandi Additional Author R.Y Purba Additional Author E.M. Fadli Additional Author H. Susilo Additional Author A. Makmur Additional Author G. Rahayu Additional Author Nur Chairat Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Tanah 1989 COVER_VOL.9_NO.2_AGUSTUS_1989.jpg