Determine the most appropriate of allowable use of Salsola laricina (Case study: Khoshkerood-e- Saveh)

Allowable use is one of the most important factors in determining grazing capacity. The present study was carried out to determine the allowable use of Salsola laricina in Khoshkerood site of Saveh. In this research, four treatments including 25%, 50%, 75% harvesting and no harvesting (control) were compared during three years. The results showed that the effect of the year and interaction of different harvesting intensities and year were statistically significant at the level of one percent. In the first year of study, there was no significant difference among treatments; however, in the subsequent years, the effects of treatments were visible. So that the treatments had the most impact on the speciesin the last year. It was clear that there was not significant difference between the 25% harvesting intensity and control treatment. These treatments had the most forage production and also, there was not a significant difference between the other two treatments. The observations showed that the vitality of species in control treatment was less than that of 25% and 50% harvesting intensities, indicating that grazing can increase the plants vitality. Based on the AMMI analysis, the first interaction principal component (IPC1) was significant at the level of 1%, so that 98.2% of the sum of squares of the interaction could be expressed by IPC1. According to the biplot of the IPC1 and mean production, the lowest production rate and stability was recorded for the harvesting intensity of 75%. According to the results, it can be stated thataharvesting intensity of 25% guarantees the survival of S.laricinain this region with no negative effect on the vitality of Salsola laricina.