Abstract:
Depleted oil bleaching earth (DOBE) is a waste discharge from palm oil refineries spent
bleaching earth (SBE) processing facilities. Seven types of organic fertilizer have been
formulated using DOBE and tested accordingly to the soil on crop establishment for planting
performance in order to investigate its efficiency on the nutrient’s availability in the soil. The
experiment was carried out at Integrated Organic Farm MARDI, Serdang. From the results, it
shown a variation of value in chemical properties of the soil, however there is no significant
difference in main nutrient content. As the correlation study done for several elements (N, P, K,
Ca and Mg) chemical properties, it did show these elements have a positive correlation and
strong association to each element. From the analysis that has been done, it gave indication and
baseline data to further improve the formulated organic fertilizers.
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