نتایج جستجو برای: the penman monteith equation for potential evapotranspiration and water balance equation to measure actual evapotranspiration were used finally

تعداد نتایج: 23387666  

2012
Mohammad Valipour

The evapotranspiration rate has a vital role in agricultural water management. In this paper, ability of Box-Jenkins models in forecasting the reference potential evapotranspiration is estimated. For this purpose meteorological data of Mehrabad synoptic station in Tehran was selected. Using this data and according to eight famous evapotranspiration equations amounts of evapotranspiration were f...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده ادبیات و علوم انسانی 1392

abstract the first purpose of this study was to investigate the effect of consciousness-raising (c-r) activities on learning grammatical structures (simple present tense in this case) by iranian guidance school efl learners. the second one was to investigate the effect of gender on learning the simple present tense through c-r activities and tasks. finally, this study aimed to investigate the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1393

the purpose of the present study was to investigate the relationship between fear of negative evaluation (fne) and communication strategies (css) among iranian efl learners. it was aimed to examine the differences in the use of communication strategies between speakers with high or low degree of fear of negative evaluation. the current study was a case study consisting of 10 english learners at...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان - دانشکده ادبیات و علوم انسانی 1389

?it is of utmost priority for an experienced teacher to train the mind of the students, and enable them to think critically and correctly. the most important question here is that how to develop such a crucial ability? this study examines a new way to the development of critical thinking utilizing critical discourse analytical tools. to attain this goal, two classes of senior english la...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1390

abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...

اسلامیان, سید سعید , زارعیان, محمدجواد, عابدی کوپایی, جهانگیر ,

Abstract Knowing crop evapotranspiration at any time is very important in management of irrigation systems for greenhouse. Changes in evapotranspiration during the crop growth period are described by crop coefficient (Kc), which is defined as the ratio between crop evapotranspiration and reference evapotranspiration. This study was conducted to determine the evapotranspiration of cucumber, tom...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده ادبیات و زبانهای خارجی 1389

within the components of communicative competence, a special emphasis is put on the “rules of politeness,” specifically the politeness strategies (brown and levinson, 1978) that speakers deploy when performing the request speech act. this is because the degree of imposition that making a request places upon one’s interlocutor(s) has been seen to be influenced by several factors among which, as ...

Journal: :مدیریت آب و آبیاری 0
هوشنگ قمرنیا دانشیار، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی کرمانشاه، کرمانشاه، ایران سجاد امیری دانشجوی کارشناسی ارشد آبیاری و زهکشی، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی کرمانشاه، کرمانشاه، ایران محمود خرمی وفا استادیار، گروه زراعت، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی کرمانشاه، کرمانشاه، ایران

for a suitable irrigation programming and an efficient management, crop coefficient determination for different plant growth stages are necessary. in this investigation water requirement, single and dual crop coefficient of rosmarinus officinalis l. was determine by drainable lysimeter in a semi-arid climate condition. by using of drainable lysimeter, the exact water requirement and also kc val...

Journal: :international journal of agricultural management and development 2015
zahra ghaffari moghadam

in this study, yield-water and profit function was used to obtain water demand function in agriculture sector. the results showed that the ratio of actual to potential evapotranspiration had positive, significant effecton the ratio of actual to potential yield for wheat and barley. also, square ratio of actual to potential evapotranspiration had negative, significant relationship. after estimat...

ژورنال: علوم آب و خاک 2008
مجد سلیمی, کوروش , میرلطیفی, سید مجید ,

In tea plantation regions of northern part of the country, application of supplemental irrigation during dry periods (lacking rainfalls) in conjuction with proper nitrogen fertilizer application can significantly improve tea yield per unit of plantation area. In order to quantify the effectiveness of proper irrigation and nitrogen management on tea, the response of tea to various levels of irri...

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