Abstract
N fixation in pasture yielding 9.4–12.2 t DM/ha varied from 90 to 241 kg N/ha/annum over two consecutive years. Factors appearing to effect N fixation and clover growth included soil moisture deficits, clover root cyst nematode predation, and possibly clover flowering. There was a large growth response to a winter fertiliser N treatment over the first 2 years of the trial, but no response in the third winter, after a season of exceptionally high N fixing activity.

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