Effect of grazer regulation and algal inoculation on photodependent nitrogen fixation in a wetland rice field |
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Authors: | I F Grant P A Roger I Watanabe |
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Institution: | (1) The International Rice Research Institute, Los Banos, Philippines;(2) Present address: Boyce Thompson Institute, Cornell University, 14853 Ithaca, NY, USA;(3) Present address: ORSTOM, France |
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Abstract: | Summary A dry season field experiment conducted for two consecutive years highlighted problems of achieving increased populations of N2-fixing blue-green algae (BGA) in wetland rice fields. Inoculation of non-indigenous BGA strains, either dried or as fresh viable inocula even at high levels of application, was unsuccessful. A limiting effect of grazing invertebrate populations on BGA establishment was evident, but other factors were involved. Reducing grazer pressure did not permit establishment of inoculated BGA; interspecific competition and environmental factors may explain the inoculation failure. Grazer regulation permitted the establishment of a fast-growing indigenous N2-fixing Anabaena and the doubling of N2-fixing activity over a control. Neither inoculation nor grazer control affected grain yields significantly. |
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Keywords: | Cyanophyceae Ostracoda Ricefields Grazing N2-fixation |
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