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The use of nitrogen-15 natural abundance and nitrogen yield ogf non-nodulating isolines to estimate nitrogen fixation by soybeans (Glycine max L.) across three elevations

, : The use of nitrogen-15 natural abundance and nitrogen yield ogf non-nodulating isolines to estimate nitrogen fixation by soybeans (Glycine max L.) across three elevations. Biology and Fertility of Soils 15(2): 81-86

Dissimilarities in soil N uptake between nitrogen-fixing and reference non-nitrogen-fixing plants can lead to inaccurate nitrogen fixation estimates by N difference and 15N enrichment methods. The N difference and delta 15N methods were compared for the measurement of nitrogen fixation by nodulating soyabeans and their respective non-nodulating isolines grown at three sites differing in mean temperature and soil N availability on the island of Maui, Hawaii (USA).

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