Journal of Rangeland

  Range managers try to maintain good conditions and restore degraded rangelands to increase forage production. Twenty plant individuals of Tanacetum polycephalum with similar size were selected in three growth stages for 4 years to evaluate the effects of different clipping intensities on some vegetative and reproductive characteristics of the species. Five plant individuals with no harvesting were considered as control and 25%, 50% and 75% clipping were applied in various plant growth stages in May, Jun and July for 4 years on each five plant species. Harvested forages were air dried separately and analyzed. A split plot based on a completely randomized design was used to analyze the data. Analysis of variance showed that species production did not differ significantly between various clipping treatments. The production of the species over the studied years varied significantly (P <0.01). The results indicated that the species production declined due to clipping, as the highest and lowest production was observed in the first and last year of treatments respectively.