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Fig. 2. Relationship between N2 fixation (%Ndfa) and the N increment (kg N ha–1). The overall relationship is described by a linear equation as follows: Ninc = 1.27 x %Ndfa – 60.5, r2 = 0.63, P <– 0.01. For individual crops, linear relationships are described as follows: pea Ninc = 1.78 x %Ndfa – 83.3, r2 = 0.47, P <– 0.05; lentil Ninc = 1.18 x %Ndfa – 56.4, r2 = 0.47, P <– 0.05; desi chickpea Ninc = 0.82 x %Ndfa – 45.3, r2 = 0.55, P <– 0.05; kabuli chickpea Ninc = 0.66(%Ndfa) – 37.5, r2 = 0.57, P <– 0.01; bean Ninc = 0.66 x %Ndfa – 34.4, r2 = 0.52, P <– 0.01; faba bean Ninc = 3.67 x %Ndfa – 240.2, r2 = 0.65, P <– 0.01.
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