Plant Soil Environ., 2008, 54(2):72-77 | DOI: 10.17221/2783-PSE

Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization

A. Kumari1, K.K. Kapoor1, B.S. Kundu1, R.K. Mehta2
1 Department of Microbiology, CCS Haryana Agricultural University, Hisar, India
2 Department of Agronomy, CCS Haryana Agricultural University, Hisar, India

The production of organic acids and changes during decomposition of rice straw amended with tricalcium phosphate (TCP) and Udaipur rock phosphate (URP) were studied under laboratory conditions. The organic C content of rice straw decreased and total N increased with time, resulting in a decrease in C:N ratio as the decomposition progressed. The pH decreased to acidic range in all the treatments on day 15, but became alkaline again later on. Soluble P increased at 15 days after incubation, declined later during decomposition, and was highest in the treatments containing TCP and Aspergillus awamori inoculation. Citric, oxalic, formic and maleic acids were detected during decomposition of rice straw and maximum amounts were present on day 15. Citric and oxalic acids were responsible mainly for P solubilization from TCP and URP; generally, citric acid was the most effective in P solubilization.

Keywords: organic acids; phosphate solubilization; rice straw decomposition; tricalcium phosphate; Udaipur rock phosphate

Published: February 29, 2008  Show citation

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Kumari A, Kapoor KK, Kundu BS, Mehta RK. Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization. Plant Soil Environ.. 2008;54(2):72-77. doi: 10.17221/2783-PSE.
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