Hosein Tavakoli; Abbas ali Sanadgol; Uosef Garivani
Volume 13, Issue 2 , February 2006, , Pages 69-73
Abstract
Russian brome (Bromus tomentellus) is a prennial grass with good adaptability to climatic condition of north Khorasan. So, it has promise for using in range improvement projects. Because threre is no enough local information about mangement of this plant, the present experiment has been conducted in ...
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Russian brome (Bromus tomentellus) is a prennial grass with good adaptability to climatic condition of north Khorasan. So, it has promise for using in range improvement projects. Because threre is no enough local information about mangement of this plant, the present experiment has been conducted in Sisab Reaserch Station (SRS) to evaluate the response of this species to grazing intensities and rest grazing. Four grazing intensities of light (20 to 45% of forage removal), moderate (45- 65% of forage removal), heavy (65- 80% of forage removal) and without grazing as control applied by herd of lamb and sheep for three consequent years from 1999 to 2001. The year of 2002 considered as rest period from grazing. Herbage mass and number of plant per unit area measured as an index response. Herbage mass production decreased by reduction in precipitation. Heavy grazing resulted in significant reduction in herbage production and number of plants per unit area, but one year rest from grazing componsated the negative effect of intensive grazing on herbage mass reduction. Management implication based on this results show that plant can tolerate grazing intensity by 45-65% of herbage removal and indicate on the importance of rest grazing on survivance of this plant.
Ahmad Ahmadi; Abbas ali Sanadgol
Volume 13, Issue 1 , February 2006, , Pages 48-52
Abstract
By considering the plant genetic erosion and plant cover retrogression, the range improvement projects such as pit seeding is essential for increasing the range forage production.The evaluation of Goladam’s rangelands showed that due to heavy and contenious grazing, many palatable species ...
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By considering the plant genetic erosion and plant cover retrogression, the range improvement projects such as pit seeding is essential for increasing the range forage production.The evaluation of Goladam’s rangelands showed that due to heavy and contenious grazing, many palatable species are facing extinction and have been seen with low vigorous and vice versa the unpalatable species had high density and vigorous. In West Azarbaijan province there is about 2321013 animal unit far from rangelands capacity, so applying a treatment that can increse forage production is nesessary. The galehdam station that located in cool semi arid region with 325.8 mm annual rainfall was selected For study the effect of pit- seeding on the range condition and range production .For determining the range condition, range production and range trend, applied the four factors method,clipping method and trend balance method respectively.The study was conducted for 5 years and seeded the Agropyron cristatum, Agropyron desertorum , Agropyron elongatum, Onobrychis sativa و Medicago sativa . The result indicated that the range condition promoted to poor condition from very poor condition, and the forage prodution increased 2 folds. The average plant cover and soil conservation reached to 28 & 86 percent at the end of study and they were significantly difference (p< 0.05).