One of the primary challenges in Indonesian marginal soil is the limited availability of macronutrients, particularly nitrogen and phosphate (P). Soil P plays an important role in plant growth and soil fertility. The acidity of the soil influences the amount of phosphorus available in the soil; acidic soils have low phosphorus availability. The phosphorus fixation reaction is pH-dependent. The use of phosphorus-solubilising bacteria improves phosphorus availability in acidic soils. The production of dissolved phosphorus and organic acids is one of the functions of the plant growth-promoting rhizobacteria (PGPR) activity of phosphorus-solubilising bacteria. The purpose of this study was to examine how acidity affects the organic acid production and dissolved phosphorus levels of phosphate-solubilising bacteria (PSB). Experiments were carried out in the Laboratory of Soil Biology, Department of Soil and Land Resources, Faculty of Agriculture, Universitas Padjadjaran. Two isolates of PGPR (Burkholderia sp. strain WK 11 and Burkholderia sp. strain MQ-14W) were used in this study, both of which were isolated from an acidic soil ecosystem. The pH 4.5, normal pH (7) and 10.5 were the levels of acidity. The result showed that the pH of the media had a significant effect on dissolved P in the media after being incubated for 7 days. The results revealed that the acidity of the water had an effect on the amount of dissolved phosphorus and the amount of organic acid produced by the phosphate-solubilising bacteria. PSB produced more organic acid (lactic, citric, oxalic, and tartaric acid) and dissolved phosphorus at pH 4.5 than at pH 7 or pH 10.5. The mechanism of phosphate solubilization by bacteria is related to their ability to produce organic acids. Each bacterium has a genetically different ability to produce organic acids, both in the amount and organic matter. The amount and organic matter are important in determining the high dissolution of P.
Author(s) Details
Betty Natalie Fitriatin
Department of Soil Sciences and Land Resouces Management, Agriculture
Faculty, Universitas Padjadjaran, Indonesia.
Detty Asna Fauziah
Agrotechnology, Agriculture Faculty, Universitas Padjadjaran, Indonesia.
Reginawanti Hindersah
Department of Soil Sciences and Land Resouces Management, Agriculture
Faculty, Universitas Padjadjaran, Indonesia.
Tualar Simarmata
Department of Soil Sciences and Land Resouces Management, Agriculture
Faculty, Universitas Padjadjaran, Indonesia.
Please see the book here:- https://doi.org/10.9734/bpi/asti/v3/5710
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