نتایج جستجو برای: water quantity

تعداد نتایج: 626056  

Journal: :تحقیقات مهندسی کشاورزی 0
مهدی اکبری استادیار موسسه تحقیقات فنی و مهندسی کشاورزی

the greatest limitations to agricultural development and production in iran are scarcity of water resources, ineffective irrigation scheduling and wasteful water usage. avenues discussed for optimum water use include improving water productivity by improving irrigation scheduling, farm water management and water profitability. the present study evaluated current water use and ways to improve wi...

ژورنال: علوم آب و خاک 2009
برومندنسب, سعید, شینی دشتگل, علی, ناصری, عبدعلی, کشکولی, حیدرعلی,

Sugarcane has been cultivated in an extensive area in Khuzestan and irrigated by hydro-flume or siphon and furrow. In a field experiment during 2005-6 at Amir Kabir Agro-Industry, Khuzestan, the effect of every other-furrow irrigation method was studied on sugarcane in regard to irrigation water volume, water use efficiency and quality and quantity of sugarcane. The experiment was conducted in ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Xi Lu Michael B McElroy Juha Kiviluoma

The potential of wind power as a global source of electricity is assessed by using winds derived through assimilation of data from a variety of meteorological sources. The analysis indicates that a network of land-based 2.5-megawatt (MW) turbines restricted to nonforested, ice-free, nonurban areas operating at as little as 20% of their rated capacity could supply >40 times current worldwide con...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2003
J S Wallace M C Acreman C A Sullivan

Human uses of freshwater resources are increasing rapidly as the world population rises. As this happens, less water is left to support aquatic and associated ecosystems. To minimize future human water shortages and undesirable environmental impacts, more equitable sharing of water resources between society and nature is required. This will require physical quantities and social values to be pl...

2010
CRISTINA MATOS ANA SAMPAIO ISABEL BENTES

-Water resources are being, over decades, intensively over explored and polluted, and it is estimated that in a few years, it is reached highly values of water stress in Europe. Portugal is already in the ranking of countries with medium water stress (10-20%). To avoid the deterioration of this situation it is imperative to consider different approaches of water management, such as water reuse ...

2017
Min Ge Feng-ping Wu Xiao-ping Chen Basant Maheshwari

Regional initial water rights is a crucial part of initial water rights and clarification of it is an essential method to improve the efficiency of water use. It also promotes sustainable use of valuable water resources. Consequently, under new circumstances of China’s most stringent water resources management, with water quantity and quality control, we propose a new perspective for a coupled ...

Journal: :JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES 2020

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