Abstract
The greenhouse experiment was carried out to study the effect of biofertilizer combined with organic or inorganic fertilizer on the growth of Caesalpinia pulcherrima and bacterial population in the soil. Biofertilizers including Azotobacter sp. (mixture of 5 isolates) Azospirillum sp. (mixture of 5 isolates) and Rhizobium sp. (mixture of 5 isolates), were applied with organic fertilizer (Palm Oil Mill Effluent/POME) or inorganic fertilizer (Muller Solution/MS) were laid out in Randomized Complete Block Design (RCBD) with three replicates. The result showed that plants which were inoculated with biofertilizer (Azotobacter, Azospirillum, and Rhizobium) showed better growth compared than control treatment. Plants treated with a combination of biofertilizers with POME or MS had higher growth than plants treated with organic or inorganic fertilizers individually. The application of an organic fertilizer on plant showed more excellent plants’ growth than the usage of organic fertilizer. However, there were no significant differences in plant growth between POME and MS combined with biofertilizer. Biofertilizer combined with organic fertilizer combination produced higher bacterial population than inorganic fertilizer combination.
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