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Effect of Soil Nutrient Status and pH on Nitrogen‐Fixing Algae in Flooded Soils
Author(s) -
Wilson J. T.,
Alexander M.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300050024x
Subject(s) - algae , soil water , phosphate , chemistry , nitrogen fixation , environmental chemistry , nutrient , nitrogen , soil ph , organic matter , agronomy , botany , environmental science , biology , soil science , biochemistry , organic chemistry
The development of indigenous N 2 ‐fixing algae in 10 of 12 flooded soils, as measured by acetylene‐reduction activity, was stimulated by the addition of phosphate. In P‐supplemented flooded soils, these algae generally developed readily at pH 7.3 or greater but poorly at pH 6.5 or less. Iron additions stimulated the activity of inoculated blue‐green algae in a phosphate‐amended flooded soil of pH 7.9 but not in a soil with a pH of 5.5. Indigenous algae in an acid soil (pH 4.8) were stimulated by CO 2 . Nitrogen fixation and development of indigenous blue‐green algae were correlated with pH and the levels of extractable K and of Ca and Mg in these soils, but not with the concentrations of organic matter, inorganic N, or extractable phosphate and Fe.