Exopolysaccharide of Nostoc muscorum (Cyanobacteria) in the aggregation of soil particles
The effects on a saline-sodic soil of exopolysaccharide isolated from Nostoc muscorum or the addition of a cyanobacterial mass proliferation were evaluated in a greenhouse experiment. By day 180 the exopolysaccharide increased soluble C by 100%, microbial activity by 366% and the amount of water-sta...
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| Autores principales: | , , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09218971_v9_n3_p249_ZulpadeCaire |
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| Sumario: | The effects on a saline-sodic soil of exopolysaccharide isolated from Nostoc muscorum or the addition of a cyanobacterial mass proliferation were evaluated in a greenhouse experiment. By day 180 the exopolysaccharide increased soluble C by 100%, microbial activity by 366% and the amount of water-stable aggregates larger than 250 μm by 12 times. Inoculation with living cyanobacterial mass increased at the end of 365 days of oxidizable C by 11%, soluble C by 66%, microbial activity by 73% and aggregates larger than 250 μm by 66%. A slimy film 3-5 mm thick, with N. muscorum predominating, covered all the surface of inoculated soils. The higher soil aggregate stability produced by both treatments is a consequence of increased microbial activity and concentrating the soil polysaccharide. The high percentage of clays favours the creation of firm and long-lasting slime-mineral joints. Addition of isolated exopolysaccharide produces a faster and higher increase in soil aggregate stability than cynobacterial mass inoculation. |
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