Deep placement: A method of nitrogen fertilizer application compatible with algal nitrogen fixation in wetland rice soils |
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| Authors: | P. A. Roger S. A. Kulasooriya A. C. Tirol E. T. Craswell |
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| Affiliation: | (1) The International Rice Research Institute, Los Baños, Philippines;(2) Present address: Office De La Recherche Scientifique Et Technique Outre-Mer, France;(3) Present address: International Fertilizer Development Center, Muscle Shoals, Alabama, USA |
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| Abstract: | Summary The effect of different methods of nitrogen fertilizer application on the algal flora and biological nitrogen fixation (Acetylene-reducing activity) in a wetland rice soil was studied in pot and field experiments. Broadcast application of urea inhibited nitrogen fixation and favored the growth of green algae. In contrast, deep placement of urea supergranules (1–2 g urea granules) did not suppress the growth of N2-fixing blue-green algae and permitted acetylene-reducing activity on the soil surface to continue virtually uninhibited. |
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| Keywords: | Biological nitrogen fixation Blue-green algae Deep placement Nitrogen fertilizers Wetland rice |
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