Abstract
Many grass species were screened by the C 2H 2 reduction assay for associated N 2-fixation. Most showed positive activity, yet none proved particularly superior to the others. Concentrated study on a few species revealed that N 2-fixation was greatly depressed as soil moisture decreased to even moderate levels. It was concluded that in Zimbabwe, appreciable grass-associated N 2-fixation is likely to be restricted to vlei areas (low-lying, seasonally waterlogged areas). N 2-fixation associated with Paspalum urvillei, a vlei species, was estimated to contribute up to 76 kg N ha −1 yr −1 and had nitrogenase activity of 39–48% of the pasture legume Silverleaf Desmodium.
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