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    • Fertilizer experimentation on oil palm in North Sumatra. 

      Malaysian International Agricultural Oil Palm Conference. International Developments in Oil Palm june 14-17 : Kuala Lumpur. Proceedings : 45846.; Akbar, Ummar 45791.; Amiruddin, D. 45792.; Ollagnier, M. 42063.; Tampubolon, F.H. 43873.