نتایج جستجو برای: water productivity

تعداد نتایج: 626905  

2010
R. E. Brummett J. Lemoalle M. C. M. Beveridge

Key-words: extraction, watershed management, ecosystem services Water productivity (WP) metrics have proven useful in comparing production efficiency of various crops. Recently, it has also been proposed to facilitate more equitable allocation of scarce freshwater resources between irrigated agriculture and fisheries. Parameterizing water productivity metrics, however, proves to be very difficu...

2009
Ken Parsons

BACKGROUND The aim of this paper is to summarise what is known about human response to heat and to use this knowledge to provide guidance on how to maintain the health, comfort and performance of people in heat waves. DESIGN The use of power and especially water are critical in providing cooling. A practical method of cooling people in a water bath is described. A warm bath slowly cooled will...

Increasing population leads to intensification of water shortage problems in arid regions. Agriculture sector is the main user of water in Iran. Bushehr province with an arid and semiarid climate is located in the south of Iran. Improvement of water productivity (WP), the value or benefit derived from the use of water, is essential in the agriculture sector for achieving food security and susta...

2008
Alexander Platonov Prasad S. Thenkabail Chandrashekhar M. Biradar Xueliang Cai Muralikrishna Gumma Venkateswarlu Dheeravath Yafit Cohen Victor Alchanatis Naftali Goldshlager Eyal Ben-Dor Jagath Vithanage Herath Manthrithilake Shavkat Kendjabaev Sabirjan Isaev

The overarching goal of this paper was to espouse methods and protocols for water productivity mapping (WPM) using high spatial resolution Landsat remote sensing data. In a world where land and water for agriculture are becoming increasingly scarce, growing "more crop per drop" (increasing water productivity) becomes crucial for food security of future generations. The study used time-series La...

2013
S. Pradhan

A field experiment was carried out during 2009-11 on a sandy loam soil of IARI, New Delhi on wheat with four levels of irrigation (rainfed, irrigations to replenish 30, 60 and 100% moisture deficit from field capacity) as main plot factors and four levels of nitrogen (0, 30, 60 and 120 kg N/ha) as subplot factors in a split plot design. The soil moisture storage in the profile showed inverse re...

Journal: :Engineer: Journal of the Institution of Engineers, Sri Lanka 2008

Journal: :Journal of experimental botany 2007
Elias Fereres María Auxiliadora Soriano

At present and more so in the future, irrigated agriculture will take place under water scarcity. Insufficient water supply for irrigation will be the norm rather than the exception, and irrigation management will shift from emphasizing production per unit area towards maximizing the production per unit of water consumed, the water productivity. To cope with scarce supplies, deficit irrigation,...

2017
Xiao Hong Wu Wei Wang Chun Mei Yin Hai Jun Hou Ke Jun Xie Xiao Li Xie

Rice cultivation has been challenged by increasing food demand and water scarcity. We examined the responses of water use, grain yield, and water productivity to various modes of field water managements in Chinese double rice systems. Four treatments were studied in a long-term field experiment (1998-2015): continuous flooding (CF), flooding-midseason drying-flooding (F-D-F), flooding-midseason...

2013
David A. Roberts Rocky de Nys Nicholas A. Paul

The energy, mining and mineral processing industries are point sources of metal-contaminated waste water and carbon dioxide (CO2). Freshwater macroalgae from the genus Oedogonium can be grown in metal-contaminated waste water to generate biomass for bioenergy applications and concomitantly bioremediate metals. However, interactions between CO2 addition and algal growth, which can affect bioreme...

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