Identifikasi Bakteri Pelarut Kalium Indigenus Dari Perkebunan Nanas

In the cultivation of pineapple (Ananas comosus) on a plantation scale, several types of inorganic fertilizers are used with relatively high doses, to increase production yields. The utilization of rhizosphere microbes such as potassium solubilizing bacteria (KSB) is expected to reduce the dose of inorganic K fertilizer application because it can dissolve potassium-fixed Al and Fe soil to become available for plants. This study aims to evaluate and characterize the potential BPK in pineapple plantations. The evaluation was carried out based on the Potassium Solubilizing Index (SI) in addition to characterizing bacteria that have the potential as KSB isolates. Potasium Solubilizing Bacteria was isolated from planting blocks with low and high production levels in the vegetative (V) and generative (G) phases with 5 replications. The results shows that there were 20 isolated CPC populations. The lowest K solubility index was 0.6 in RV1 and the highest was 1.2 in RG1. RG1 isolate is gram-positive and grows maximum at pH 5, temperature 300C. The phylogenetic test showed that Bacillus subtilis is a potassium solubilizing isolate with the same degree of similarity