Perennial ryegrass Lolium Perenne L. can be utilised as the dominant/single species of grass used in a farming system across New Zealand. Perennial ryegrass is suited to medium to fertile soils and is very tolerant to a range of managements. Its persistence across New Zealand is varied due to the range of climatic conditions and farm systems that it is utilised in. The success of perennial ryegrass is often linked to its relationship with endophyte which provides insect protection and added resilience when the plant is stressed. 

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