Study on Phosphate Solubilizing Bacteria from Banana Pseudostem IMO as Biofertilizer on System of Rice Intensification

Abstract

The two rice farmer groups namely “Asemjajar” and “Makmur” in Wonorejo District-Pasuruan, Indonesia make a banana pseudostem IMO which is used to replace synthetic P fertilizer. This study aimed to: 1. determine if the banana pseudostem IMO contains P elements that can replace synthetic phosphate fertilizers.; 2. Determined whether the banana pseudostem IMO contains phosphate solubilizing bacteria and identified it 3. verified the effect of bacterial inoculant application which was found to the rice growth and production in System of Rice IIntensification. The greenhouse study was a simple experiment using a completely randomized design with 4 treatments i.e. A: ½ dose of manure fertilizer + ½ dose of synthetic fertilizer; B: ½ dose of manure fertilizer + ½ dose of synthetic fertilizer + banana pseudostem IMO; C: ½ dose of manure fertilizer + ½ dose of synthetic fertilizer + bacterial inoculants; D: 1 dose of synthetic fertilizer. The results showed that banana pseudostem IMO contains only 0.025% P2O5. Morphological and biochemical identification results showed that the phosphate solubilizing isolates which were found in banana pseudostem IMO was Serratia marcescens. The greenhouse test results showed that the application of S. marcescens inoculant had a significant effect on the number of tillers at the age of 4-6 weeks after transplanting, increased the weight of 1000 seeds, lowered the empty grains percentage and speeded up the harvest time.