Study of the Suitable Time of Entry and Exit(Range Readiness) of Livestock in key ranges of 5 climatic zones of Iran (Jashloubar _] Semnan Province)
2011
Mirakhorli, Rasool
Range species consist of different plant species, each with different vegetative and reproductive stages.Howevere each species has a particular time period for growing readiness and grazing at a particular time must also stop. Thus rangeland soil is ready only incertain time of sever livestock. So in order to determine the timing of entry and exit of livestock to and from rangeland this study was carried out in a semi-steppe rangeland in Jashloubar of Semnan, for five years from 2006 to 2010. The results showed that Grasses grouwth in April and Forbes in May, flowering in June and sleep in Aguste occurred. There were significant differences among seven species of rangeland in terms of phenology stages in the years studied. Plant growth in wet years starts 10 or 14 days earlier, and in dry years the same period also begins later in terms of vegetative and reproductive activity of different plants.Thus between species in flowering and growing was significant differences. In addition metorological, soil moisture and phonological stages, time of animal entry is end of April. Time of animal exit from rangeland, therefore allowable use factor(50 percent), is end of September.
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