نتایج جستجو برای: net water required for farming

تعداد نتایج: 10653522  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده جغرافیا 1392

the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...

Journal: :محیط شناسی 0
تورج نصرآبادی استادیار گروه برنامه ریزی، مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران الهام عرب کارشناس ارشد برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران فرزام پوراصغر سنگاچین دکترای برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران

introduction the average annual precipitation in iran is about 250 mm that is not regularly distributed spatially and temporally. more than 70 percent of total precipitation is not accessible due to evapotranspiration. total renewable water resources of the country are estimated to be around 130 billion cubic meters. in spite of limitation in water resources, they are not used properly. agricul...

ژورنال: علوم آب و خاک 2011
سید هدایت ا... نوری, , عباس امینی فسخودی, ,

Studying the sustainability of farming systems entails the integrated assessment of the strong interdependence between their environmental, economic and social attributes. Optimum allocation of water resources in a farming system improves the conservation and sustainability status of resources in addition to reducing the socio-economical damages. In order to analyze and assess the different asp...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1392

gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...

Journal: :international journal of agricultural management and development 2014
mohammad reza bakhshi behnaz nejati mofid shateri

in recent years, farming section of south khorasan province faces different limitations such as increasing shortage of water resources and continuous reduction of weather showers.considering consecutive droughts and water crisis in agricultural plain of the province, it is necessary to use water resources optimally and increase productivity of water shortage input. comparison of water productiv...

Behnaz Nejati Mofid Shateri Mohammad Reza Bakhshi

In recent years, farming section of South Khorasan Province faces different limitations such as increasing shortage of water resources and continuous reduction of weather showers.Considering consecutive droughts and water crisis in agricultural plain of the province, it is necessary to use water resources optimally and increase productivity of water shortage input. Comparison of water productiv...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده کشاورزی 1394

with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...

ژورنال: علوم آب و خاک 2019

Shortage of irrigation water is a major problem constraining in agricultural production in arid and semi-arid regions. Deficit irrigation is one way to cope with water scarcity and increase water use efficiency. Determining the optimum applied water based on economic analysis is a major key to the deficit irrigation strategy. In this study, the required equations were derived to determine the o...

Journal: :ecopersia 0
mohammad reza dahmardeh ghaleno former ph.d. student, department of watershed management, gorgan university of agricultural sciences and natural resources, gorgan, iran. at present: assistant professor, department of watershed and rangeland management, university of zabol, zabol, iran vahedberdi sheikh associate professor, department of watershed management, gorgan university of agricultural sciences and natural resources, gorgan, iran amir sadoddin associate professor, department of watershed management, gorgan university of agricultural sciences and natural resources, gorgan, iran mahmood sabouhi sabouni professor, department of agricultural economics, ferdowsi university of mashhad, mashhad, iran

the optimal cropping pattern for sistan water resources management was determined through a goal programming technique within the gams programming environment. results showed that the optimum cultivation area and net profit of the agricultural sector in the sistan region could increase up to 18.1 and 39.8%, respectively, compared to the current status. an increase in the farm irrigation efficie...

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