Measurements of nitrogen fixation in fababean at different N fertilizer rates using the 15N isotope dilution and ‘A-value’ methods
作者： G. Hardarson , S. K. A. Danso , F. Zapata , K. Reichardt
DOI: 10.1007/BF00009445
关键词:
摘要: The 15N isotope dilution and A-value methods were used to measure biological nitrogen (N2) fixation in field grown fababean (Vicia faba L.), over a 2-year period. Four N rates, 20, 100, 200 400 kg ha−1 examined. two gave similar values of % derived from the atmosphere (%Ndfa). With 20 ha−1, %Ndfa was about 85% both years. Increasing rate 100 decreased N2 slightly 75%. Further reductions fixed 60 43% occurred where applied, respectively. Thus even higher rates than normally applied farming practice could not completely suppress fababean.
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