Phosphorus Solubilizing Microorganisms in the Rhizosphere of Local Rice Varieties Grown without Fertilizer on Acid Sulfate Soils |
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| Authors: | Erry Purnomo Athaillah Mursyid Muhrizal Syarwani Ahmadi Jumberi Yasuyuki Hashidoko Toshihiro Hasegawa Saori Honma Mitsuru Osaki |
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| Institution: | Center for Tropical Acid Soils Studies, Graduate Studies for Natural Resource Management, Lambung Mangkurat University, Gedung I, Banjarbaru, South Kalimantan 70714, Indonesia;;Balittra, Kebun Kelapa, Loktabat, Banjarbaru, South Kalimantan, Indonesia;Graduate School of Agriculture, Hokkaido University, Sapporo, 060–8589 Japan;Atmospheric Impact Units, Department of Global Resources, National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki, 305–8604 Japan |
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| Abstract: | Local farmers who living in South Kalimantan (Banjarese farmers) apply almost none of phosphatic (P) fertilizers to grow local rice varieties. This practice has been adopted for many years. We have investigated the mechanisms involved in P availability for the crop. This study focuses on identifying microorganisms involved in solubilizing insoluble P. The study was conducted in Balandean District, South Kalimantan, Indonesia. The soil was classified as acid sulfate soil. Three out of 8 rice varieties grown were selected for net P balance in the soil-plant system and the microbial studies. We found that the P uptakes by the rice crop was much higher than the sum of P released from soil, water and soil microbial biomass P. It was also observed that these soils harboured bacteria and fungi that have the capability of dissolving aluminium phosphate (AIPO4) and tricalcium phosphate Ca3(PO4)2].
Based on the area of clear zone on plates, it seem that there were variations of ability in dissolving Al-P or Ca-P. DNA sequence analysis shown that Burkholderia sp. was the common P solubilizing bacterium found in the rhizosphere of rice varieties Siam Unus, Siam Ubi and Siam Puntal. The presence of other bacteria was specific for each rice variety grown. |
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| Keywords: | acid sulfate soil local rice P solubilizing bacteria rhizosphere |
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