Abstract
The quantitative distribution of nitrogen-fixing cyanobacteria in a wide range of 58 rice soils was assessed. Their number varied between 0.55 × 104 and 18.40 × 104 with a mean of 3.22 × 104 g−1 soil. Out of 93 recorded cyanobacteria belonging to 32 genera, the most abundant nitrogen-fixing genera were Nostoc,Calothrix, Hapalosiphon and Fischerella. Generally, Calothrix marchica and Nostoc linckia were well represented and distributed in all the districts. Species of Chroococcus, Gloeocapsa,Phormidium and Plectonema were recorded as the most common nonheterocystous forms. About 50% of the total recorded cyanobacteria were found to be heterocystous diazotrophic species. A significant coefficient of single correlation suggested that nitrogen-fixing cyanobacteria varied directly with soil pH. Multiple correlation revealed that the effect of pH together with organic carbon, total N and available P is significantly better in the variation of cyanobacteria in soil than their individual contribution. Results suggest that variation in the cyanobacterial population, particularly nitrogen-fixing ones, is a joint result of pH, organic C, total or available N and P of the soils.
One experiment, conducted with basudin and furadan to evaluate their effect on growth and nitrogen fixation by Nostoc commune and Calothrix marchica,showed a stimulatory effect of basudin up to 1000 mg L−1 on both parameters. Contrary to this, furadan inhibited growth and nitrogen fixation even at the lowest dose (3 mg L−1).
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Begum, Z.N.T., Mandal, R., Khan, Z.U.M., Hossain, M.Z. (1996). Prospect and potentiality of cyanobacteria as an alternative source of nitrogen fertilizer in Bangladesh rice cultivation. In: Rahman, M., Podder, A.K., Van Hove, C., Begum, Z.N.T., Heulin, T., Hartmann, A. (eds) Biological Nitrogen Fixation Associated with Rice Production. Developments in Plant and Soil Sciences, vol 70. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8670-2_14
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DOI: https://doi.org/10.1007/978-94-015-8670-2_14
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