نتایج جستجو برای: russian knapweed acroptilon repens l
تعداد نتایج: 662187 فیلتر نتایج به سال:
Landscape groundcover plants are a diverse group of trailing or spreading species that naturally form continuous soil coverage.Ground cover plants that were used in this study consisted of vegetative propagules of: Vinca minor L. ٬Variegatum’, Vinca minor L. ٬Green’, Oxalis brasiliensis G. Lodd, Trifolium repens L., Phyla nodiflora L. and Frankenia thymifolia Desf. The aim of this study was to ...
شناسایی علفهای هرز مزارع به عنوان اساسیترین اقدام در مدیریت علفهای هرز محصولات زراعی محسوب میشود. براساس سطح زیر کشت و مساحت مزارع در شهرستان اشتهارد، طی 5 سال با شمارش علفهای هرز به تفکیک جنس وگونه در هر پهنه در نقاط نمونهبرداری، شاخصهای جمعیتی آنها محاسبه گردید. در هر پهنه طول و عرض جغرافیایی و ارتفاع از سطح دریا مکان مورد اندازهگیری توسط دستگاه GPS ثبت شد. نتایج نشان داد که در شهرستا...
نظر به تنوع زیاد علف های هرز در مزارع گندم دیم و آبی استان آذربایجان شرقی و با هدف اطلاع از وجود علف های هرز غالب خاص و تهیه نقشه پراکنش آنها، مزارع گندم استان بر اساس روشی یکسان مورد بررسی و آماربرداری قرار گرفتند. طی نه سال (1379 تا 1388 ) در نوزده شهرستان موجود استان با فلورهای نسبتاً متفاوت براساس سطح زیر کشت و مساحت مزارع حدود 231 مزرعه گندم آبی و دیم بررسی شدند. نتایج نشان داد که در مزار...
this study was conducted in order to sustainable conservation and utilization of trifolium genetic resources. a total of 1333 accessions of trifolium under 32 species from 27 provinces were collected according to ipgri descriptors. collected germplasms are conserved in mid- and long-term conservation at national plant gene bank of iran. statistical parameters of tendency to center and dispersio...
The Russian wheat aphid, Diuraphis noxia (Mordvilko) (Homoptera: Aphididae), has been a major economic pest of small grains in the western United States since its introduction in 1986. Recently, a new Russian wheat aphid biotype was discovered in southeastern Colorado that damaged previously resistant wheat, Triticum aestivum L. Biotype development jeopardizes the durability of plant resistance...
Human dirofilariasis caused by Dirofilaria immitis and Dirofilaria repens have been reported in Malaysia. This is the fourth reported case of dirofilariasis caused by D. repens. The patient was a Chinese male from Kuching Sarawak, Malaysia who presented with a one day history of redness and itchiness over the temporal aspect of his left eye. A worm was seen and later removed from beneath the co...
691 The genus Dirofilaria includes various species that are natural parasites of dogs, cats, foxes and wild mammals. Dirofilaria immitis is the species occurring in the right ventricle and pulmonary artery of the dogs. The worm commonly known as dog heart worm, is widely dispersed and found in the tropics, subtropics and temperate zones. Another naturally occurring species commonly encountered ...
Plants, under stressful conditions, can proceed to photosynthetic adjustments in order to acclimatize and alleviate the detrimental impacts on the photosynthetic apparatus. However, it is currently unclear how adjustment of photosynthetic processes under environmental constraints by plants influences CO2 gas exchange at the ecosystem-scale. Over a 2-year period, photosynthetic performance of a ...
Free radicals are not only destructive to the living cells but also reduce the quality of animal products through oxidation. As a result the superoxide anion radical (O2-), one of the most destructive reactive oxygen species, is a matter of concern for the animal scientists as well as feed manufacturers to ensure the quality of product to reach consumers demand. The superoxide anion radical sca...
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