The aim of this research was to determine the effect of Bio-slurry fertilizer on various types of soil to the growth of oil palm seedlings in pre-nursery. Factorial completely randomized design was used in this research. The first factor was the kind of soil, which consists of two levels: latosols and regosols. ?The second factor was the dose of Bio-slurry fertilizer consisting of four levels : 50 ml tan-1, 100 ml tan-1, and 150 ml tan-1 and standardfertilizers dosage (NPKMg and Urea) as a control. The results showed that Bio-slurry fertilizer can replace the role of inorganic fertilizer in spurring the growth of oil palm seedlings in pre-nursery. Regusols provides better growth of palm seedlings than latosols.?Keywords: Bio-slurry, latosols, regusols, oil palm seedling?
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