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The nitrogen difference method (NDM) for quantifying N2 fixation, based on the same amount of soil N exploited by N2-fixing and non-N2-fixing plant, may not be suitable to plants with different root traits. We tested the reliability of NDM in legume-based intercropping systems by two field experiments in Northwest China. In experiment 1, faba bean (Vicia faba), pea (Pisum sativum), and soybean (Glycine max...
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