Blue-green algae or Azolla additions on the nitrogen and phosphorus availability and redox potential of a flooded rice soil |
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| Authors: | KC Saha BC Panigrahi PK Singh |
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| Institution: | Laboratory of Blue-Green Algae, Division of Soil Science & Microbiology, Central Rice Research Institute, Cuttack-753006, Orissa, India |
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| Abstract: | Freshly-harvested blue-green algae (20 t ha?1) or Azolla (20 t ha?1) were incorporated into a waterlogged rice soil and changes of redox-potential and the availability of nitrogen and phosphorus were measured periodically. The soil progressively became reduced where blue-green algae or Azolla had been incorporated. The rate of N release from Azolla was more rapid than from blue-green algae and the amounts released after 7–35 days of flooding were between 41 and 76% and 12 and 35% respectively. Increased P availability was also recorded in soil following the incorporation of blue-green algae or Azolla and reached highest values after 21 days incubation. |
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