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Changes in nitrogen fixation in flooded paddy field soil amended with rice straw and ammonium sulfate


Changes in nitrogen fixation in flooded paddy field soil amended with rice straw and ammonium sulfate



Riso 28(1): 29-34



N fixation was studied in a flooded paddy field soil amended with rice straw and employing N15 tracer technique. The contribution by free-living N-fixing bacteria amounted to 7 kg N/ha in unamended soil. Addition of rice straw further enhanced this value to 25 kg N/ha. (NH4)2SO4 suppressed N fixation even in the presence of 5 t[tons]/ha rice straw but, when the level of rice straw was increased to 10 t/ha, (NH4)2SO4 was not inhibitory. Rice plant stimulated N fixation particularly during the tillering stage. Fresh cellulose application to soil under different treatments also resulted in effective N fixation. The nature, availability and decomposition products of organic matter influence the rate and extent of N fixation under lowland rice cultivation.

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