Abstract
Biological nitrogen fixation (BNF) in mixed legume/grass pastures is reviewed along with the importance of transfer of fixed nitrogen (N) to associated grasses. Estimates of BNF depend on the method of measurement and some of the advantages and limitations of the main methods are outlined. The amounts of N fixed from atmospheric N2 in legume/grass pastures throughout the world is summarised and range from 13 to 682 kg N ha-1 yr-1. the corresponding range for grazed pastures, which have been assessed for white clover pastures only, is 55 to 296 kg N ha-1 yr-1.
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