Hexaploid caucasian clover (Trifolium ambiguum) was one of the components of a 25-species pasture mixture overdrilled into hieracium-infested fescue tussock grassland. The mixture was subjected to 60 different annual sulphur and phosphate fertiliser rate, stocking rate, and stocking method treatments for 16 years. Caucasian clover was slow to establish but increased to become the dominant species in the pastures under high fertiliser inputs after a decade, but only a minor species at lower inputs. Keywords: fertiliser, grazing management, high country, Trifolium ambiguum
