effect of drought stress and different levels of shade on the growth and performance of wheatgrass and tall fescue
نویسندگان
چکیده
a few information about the combined effects of different environmental stress on turfgrass physiology and growth is available. also, a separate study of environmental factors on plant cannot be a suitable model for natural conditions. this study was conducted to investigate the interactive effects of different levels of shade (0, 50, and 70%) and water treatments (well-watered and non-irrigated) on visual quality and root characteristics of wheatgrass (agropyron deserturum l.) and tall fescue (festuca arundinacea schreb. ‘forager’) in a factorial arrangement based on a completely randomized design. under different levels of shade (50 and 70%), the negative effects of drought stress on the rate of dehydration, visual quality, ion leakage and the mortality rate of surface and deep roots was reduced. according to the ornamental performance, tall fescue had better performance than the wheatgrass under drought stress conditions and full sunlight, but wheatgrass was more successful than tall fescue under drought stress and 70% shade level. under moderate shade (50%) and drought stress, tall fescue spent more time to dehydrate than wheatgrass. it can be concluded that in water stress conditions, shading could be useful to cope with drought stress, which needs to be further investigated.
منابع مشابه
the effect of task cognitive complexity and time limit on the performance of the learners with different proficiency levels in second language writing skill
this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...
15 صفحه اول: the effect of sericin levels (silk glue protein) on rate of in vitro maturation, fertilization and culture of sheep oocytes
هدف از آزمایش اول بررسی اثر سطوح مختلف سریسین [0 (control), 0.1, 0.5, 1.0, 2.5 %] افزوده شده به محیط , ivm بر cumulus cell expansion، بلوغ هسته و توسعه متوالی جنین، در گوسفندان نژاد سنجابی در فصل تولید مثلی می باشد. از سرگیری میوز به وسیله خارج شدن اولین پولار بادی اندازه گیری و هم چنین درصد رسیدن جنین های دو سلولی به مرحله کلیواژ و بلاستوسیت نیز به عنوان نشانه ای از میزان شایستگی توسعه اولیه ج...
the effect of explicit teaching of metacognitive vocabulary learning strategies on recall and retention of idioms
چکیده ندارد.
15 صفحه اولthe effects of planning on accuracy and complexity of iranian efl students’ written narrative task performance
this study compared the different effects of form-focused guided planning vs. meaning-focused guided planning on iranian pre-intermediate students’ task performance. the study lasted for three weeks and concentrated on eight english structures. forty five pre-intermediate iranian students were randomly assigned to three groups of guided planning focus-on-form group (gpfg), guided planning focus...
15 صفحه اولthe effect of metacognitive strategy instruction on efl learners reading comprehension performance and metacognitive awareness
چکیده ندارد.
15 صفحه اولthe effects of time planning and task complexity on accuracy of narrative task performance
هدف اصلی این تحقیق بررسی تاثیر برنامه ریزی زمانی، هم چنین افزایش میزان پیچیدگی تکالیف در نظر گرفته شده بصورت همزمان، بر دقت و صحت و پیچیدگی عملکرد نوشتاری زبان آموزان می باشد. بدین منظور، 50 نفر از دانش آموزان دختر در رده ی سنی 16 الی 18 سال به عنوان شرکت کنندگان در این زمینه ی تحقیق در نظر گرفته شدند و به دو گروه آزمایشی و کنترل بصورت اتفاقی تقسیم شدند. اعضای گروه آزمایشی هر دو تکلیف ساده و پی...
منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
علوم باغبانی ایرانجلد ۴۶، شماره ۴، صفحات ۵۲۳-۵۳۴
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023