نتایج جستجو برای: agropyron desertorum
تعداد نتایج: 702 فیلتر نتایج به سال:
Pine regeneration following wildland fire continues to be a serious problem across the western and southeastern U.S. Frequency of large wildfires has increased over the last several decades and restoration of these burned areas is a major problem confronting land managers. Prescribed fires are used primarily to reduce heavy fuel loads and secondarily to reduce competition or prepare sites for n...
Integrating use of seedings of perennial cool-season grasses with native range is used to increase available forage and for maintaining a high plane of nutrition for grazing livestock. Our goal was to evaluate performance of yearling cattle and stand persistence of 3 released wheatgrass cultivars. Twice replicated 3-ha pastures were seeded to ‘Rosana’ western wheatgrass [Pascopyron smithii (Ryd...
Medusahead (Taeniatherum caput-medusae [L.] Nevski) is an exotic annual grass invading western rangelands. Invasion by medusahead is problematic because it decreases livestock forage production, degrades wildlife habitat, reduces biodiversity, and increases fire frequency. Revegetation of medusahead-invaded sagebrush steppe is needed to increase ecosystem and economic productivity. Most efforts...
گونههای مختلف Agropyron در تولید علوفه در مراتع ایران نقش مهمی داشته و مقاوم به تنشهای محیطی هستند. در این پژوهش تنوع ژنتیکی جمعیتهای Agropyron desertorum، Ag. cristatum، Ag. pectiniforme و Ag. elongatum با استفاده از نشانگرهای RAPD مورد مطالعه قرار گرفت. برای این منظور از 50 آغازگر تصادفی استفاده شد که از بین آنها 12 آغازگر نوارهای مشخص و با وضوح بالا تولید کرده و مورد استفاده قرار گرفتند. ...
The most important and sensitive level in the modification of rangelands surrounding the mine is the initial seedling establishment of plants, which often faces failure due to adverse environmental conditions, poor soil nutrients, disturbance of soil different layers and its instability and unstable soil around the mines. New methods of rangeland improvement using biological and non-biological ...
Agropyron Gaertn. (P genome) is a wild relative of wheat that harbours many genetic variations that could be used to increase the genetic diversity of wheat. To agronomically transfer important genes from the P genome to a wheat chromosome by induced homoeologous pairing and recombination, it is necessary to determine the chromosomal relationships between Agropyron and wheat. Here, we report us...
The ant genus Odontomachus Latreille in the United States is reviewed. Six species are treated: O. brunneus (Patton), O. clarus Roger, O. desertorum Wheeler stat. nov., O. relictus Deyrup and Cover, O. ruginodis M.R. Smith, and O. haematodus (Linnaeus), a new record for North America. The spread of O. haematodus is documented, and its identity is clarified. The genus is diagnosed for species in...
به منظور بررسی ارتباط بین عملکرد علوفه و صفات مورفولوژیک، 31 ژنوتیپ علف گندمی بیابانی، در دو آزمایش جداگانه ی آبی و دیم، به صورت متراکم در کرت هایی به ابعاد یک در دو متر و در قالب طرح بلوک های کامل تصادفی با سه تکرار، در مزرعه ی مجتمع تحقیقاتی- آموزشی شهرک دانشگاهی دانشگاه آزاد اسلامی اراک کشت و صفات تاریخ ظهور سنبله و گرده افشانی، ارتفاع بوته، طول سنبله، تعداد سنبلچه در سنبله، اندازه ی برگ پرچ...
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