Summary
Effects of soil chemical properties on biological N2-fixation (BNF) byTrifolium subterraneum L. ‘Mt. Barker’ —Rhizobium trifolii strain 162×95 were studied on thirteen soils in a greenhouse experiment. Dry matter production of inoculated/+N plants indicated three groups of soils. Mean soil solution activities of Al3+ were 29.4, 9.8 and 0.1 μM for groups of soils with no BNF, limited BNF, and unlimited BNF, respectively. Using easily measurable soil chemical properties, the following equation related relative dry matter production to pH and soil Al saturation: Inoculated/+N×100=−140+46.83 (soil solution pH) −0.31 (Al concentration ×100/CEC) (r2=0.66).
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Wright, S.F., Wright, R.J. & Bennett, O.L. Comparative growth responses of N2-fixing and N-fertilized subterranean clover on acid soils. Plant Soil 97, 151–154 (1987). https://doi.org/10.1007/BF02149833
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DOI: https://doi.org/10.1007/BF02149833