15N natural abundance as a tool for assessing N2-fixation of herbaceous, shrub and tree legumes in improved fallows

By S. Gathumbi, G. Cadisch, K. E. Giller. 2002

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Niche-based assessment of contributions of legumes to the nitrogen economy of Western Kenya smallholder farms (2007, methodology): “Assumed e Gathumbi et al. (2002) f Percent N derived from atmospheric fixation estimated using maize as reference plant g Percent N derived from atmospheric fixation estimated using several broad-leaved weed plants presented in Table 3 as reference plants”
Productivity and residual benefits of grain legumes to sorghum under semi-arid conditions in southwestern Zimbabwe (2007, background): “%) have been reported in groundnut (Bell et al. 1994; Gathumbi et al. 2002), whereas in this study groundnut values ranged between 19 and 83% across the three seasons (Table 4).”
Woody legume fallow productivity, biological N2-fixation and residual benefits to two successive maize crops in Zimbabwe (2004, methodology): “Gathumbi et al. (2002) suggested that plant available soil N 15N signatures should preferentially be > 5 for use in tree-based fallow systems.”