Soils of Malaysia by Ashraf Muhammad Aqeel Othman Radziah Fauziah Ishak

Author:Ashraf, Muhammad Aqeel,Othman, Radziah,Fauziah Ishak
Language: eng
Format: epub
Publisher: CRC Press LLC

FIGURE 5.10 Transmission electron microscopic micrographs showing (a and b) nitrogen-fixing bacteria isolated from wetland rice at Tanjung Karang, Selangor, (c) PSB isolated from aerobic rice at Kepala Batas, Penang (d) acid sulfate bacteria isolated from acid sulfate soils at Semerak, Kelantan, Malaysia.

FUNCTIONS AND BENEFICIAL CHARACTERS OF THE SOIL MICROORGANISMS

RELEASING NUTRIENTS FROM ORGANIC MATTER

Soil microorganisms are accountable for most of the nutrient release from organic matter. When microorganisms decompose organic matter, they use the carbon and nutrients in the organic matter for their own growth. They release extra nutrients into the soil where they can be taken up by plants. If the organic matter has a low nutrient content, microorganisms will take nutrients from the soil to meet their requirements. For example, applying organic matter with C:N ratios lower than 22:1 to soil generally increases mineral nitrogen in soil. In contrast, applying organic matter with C:N ratios higher than 22:1 usually results in microorganisms taking up mineral nitrogen from soil (Hoyle et al., 2011).

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