GROWTH OF AZOLLA IN PADDY FIELD AS AFFECTED BY PHOSPHORUS FERTILIZER
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概要
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The aquatic fern Azolla can grow without combined nitrogen due to the N_2-fixing symbiotic cyanobacteria Anabaena azollae.The biomass production and nitrogen accumulation of Azolla pinnata in Philippine paddy fields were examined.Twenty-two continuous croppings of Azolla in 1 year yielded 8 t dry matter/ha and 465 kg N/ha.The growth rate and N_2-fixing activity fluctuated between the seasons. Different methods of applying phosphorus fertilizer were tested to increase the Azolla yield.Split applications of 2.5 kg P_2O_5/ha as superphosphate applied 6 times(total, 15kg P_2O_5/ha)increased the Azolla yield more than basal applications.This yield was equal to that obtained at 30kg P_2O_5/ha basal or split applications.The highest apparent phosphorus absorption efficiency was 23%. Another experiment suggested that split applications of about 1kg P_2O_5/ha were sufficient if the phosphate fertilizer was applied every 2 to 4 days.From these experiments, we calculated that Azolla will produce 1.9kg additional nitrogen with applications of 1kg P_2O_5.
著者
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Del Rosario
The International Rice Research Institute
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Watanabe Iwao
The International Rice Research Institute
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BERJA Nilda
The International Rice Research Institute
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