SEASONAL CHANGE OF N_2-FIXING RATE IN RICE FIELD ASSAYED BY IN SITU ACETYLENE REDUCTION TECHNIQUE : I. Experiments in Long-term Fertility Plots
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概要
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The contribution of blue-green algae and heterotrophic bacteria in or around the rice roots to nitrogen (N_2) fixation in a submerged rice soil was assessed by in situ acetylene-reduction assay. A 24-hr assay was conducted every 3 weeks for 48 weeks in the International Rice Research Institute (IRRI) long-term fertilizer plots at Los Banos, Philippines. Unfertilized plots and NPK fertilizer plots were used. In unfertilized plots, the highest peak of in situ acetylene-reduction activity appeared late in the growing season, in both wet-and dry-season crops, when the activity and biomass of blue-green algae in the flooded water were highest. In the unfertilized plot, a close correlation was found between in situ N_2-fixation activity and in vitro photo-dependent N_2-fixation activity of the flood water, which included floating algae and epiphytic algae on the weeds. N_2-fixing activity of the flood water, which included floating algae and epiphytic algae on the weeds. N_2fixing activity of blue-green algae assayed both in the field and in the laboratory was lower in fertilized plots than in unfertilized plots. When the activity of the blue-green algae was high, the replacement of the flood water including surface soil with distilled water, to eliminate the bulk of algal activity, greatly reduced the in situ acetylene-reduction activity. That suggests that blue-green algae contribute more to acetylene-reduction activity than do the microorganisms in the proximity of rice roots. Additional Index Words : N_2 fixation of rice soils.
- 一般社団法人日本土壌肥料学会の論文
著者
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Watanabe Iwao
The International Rice Research Institute
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Lee K.k.
The International Rice Research Institute
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ALIMAGNO B.V.
The International Rice Research Instiute
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