Peningkatan Ketersediaan Phosphat pada Tanah Masam Melalui Inokulasi BPF dan Penambahan Bahan Organik

Minarsih S, Samijan S, Arianti FD. 2020. Increasing the availability of phosphate in acid soils through inoculation of phosphate solubilizing bacteria and adding organic matter to the soil. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-8 Tahun 2020, Palembang 20 Oktober 2020. pp. xx. Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).Phosphate is one of the macro elements whose availability is limited in acid soils because it is bound by soil minerals. Phosphate solubilizing bacteria are able to dissolve phosphate bound by soil minerals so that its availability increases, the addition of organic matter is also able to increase the availability of phosphate through organic acids resulting from its decomposition. This study aims to determine the types of phosphate solubilizing bacteria and kinds of organic matter that can increase the availability of phosphate in the soil. The experiment was carried out in the greenhouse of Sebelas Maret University Surakarta. Using a completely randomized design with 2 factors. Factor I was the inoculation of Phosphate Solubilizing Bacteria consisting of 3 levels, namely without inoculation of phosphate solubilizing bacteria (I0), Bacillus subtilis inoculation (I1), and Pseudomonas fluorescent inoculation (I2). The second factor are the type of organic material consisting of 4 levels, namely: no organic matter (B0), rice straw (B1), Tithonia diversifolia (B2), and Leucaena leucochepala (B3). The results showed that the use of Tithonia diversifolia organic matter independently proved to be the most effective in increasing available P in the soil by 261%. Bacillus subtilis combined with organic rice straw was able to increase the availability of P by 169%, then followed by the combination of Bacillus subtilis with organic material Tithonia diversifolia was able to increase P by 155% and the combination of Bacillus subtilis with Leucaena leucochepala increased P by 23%