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Nitrogenase activity of blue-green algae on seasonally flooded soils in Bangladesh

J.A. ROTHER and B.A. WHITTON
Plant and Soil
Vol. 113, No. 1 (January (I), 1989), pp. 47-52
Published by: Springer
Stable URL: http://www.jstor.org/stable/42937729
Page Count: 6
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Nitrogenase activity of blue-green algae on seasonally flooded soils in Bangladesh
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Abstract

Blue-green algal communities formed an extensive cover on soils at five deepwater rice-growing locations in Bangladesh during the month before the arrival of floodwater. The principal taxa were Anabaena, Cylindrospermum, Lyngbya, Microcoleus, Nostoc, Porphyrosiphon notarisii, Scytonema mirabile and Tolypothrix byssoidea. One of two locations studied after the floodwaters had receded also had an extensive cover, mainly Scytonema mirabile. Nitrogenase activity assayed at mid-day was from one to three orders of magnitude higher per unit area of community than bare soil. Nostoc showed higher activity than Tolypothrix, whether expressed per unit area or biomass. Whole field estimates of N₂ fixed by blue-green algal communities during the pre-flood period ranged from 1.0 to 10.2 kg N ha⁻¹. Much of this is probably not recycled until floodwaters cover the fields. However N₂ fixed after floodwaters have receded is probably recycled rapidly due to ploughing.

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