Water is the most limiting factor for plant growth and crop productivity (Kramer, 1983), and water-deficit stress adversely affects crop growth and yield throughout the world (Boyer, 1982). Crop yields are being reduced by drought and the increasing scarcity of water for irrigation, and changing world climatic trends may increase the severity of the problem (Le Houerou, 1996). Water availabilit...

A debate has long existed on the relationships between human population, natural resources, and development. Recent research has expanded this debate to include the impacts of trade; specifically, virtual water trade, or the water footprint of traded commodities. We conduct an empirical analysis of the relationships between virtual water trade, population, and development in Africa. We find tha...

introduction continuing environmental crisis, human was aware of the necessity for revising its method of dealing with the environment during the development. therefore, changing the development paradigm from classical to modern, sustainable development and environmental issues become major pillars of development and achieve sustainable development depends on the complete recognition of environ...

The water sector in the last 20 years has undergone radical paradigm shifts arising from the crisis of global proportions that have characterized the sector, prompting many international fora, including the Dublin conference in January 1992. One of the responses from academic institutions to this crisis is the development of computer-based predictive tools for better and more accurate predictio...

Water resources management is one of the most important challenges the world faces. It is difficult to think of a resource more essential to the health of human communities or their economies than water. Humans cannot live for more than several days without water, shorter than for any source of sustenance other than fresh air. In meeting their demand for water, societies extract vast quantities...

abstract- to investigate the effect of draught stress on water relations, stomatal density, chlorophyll content and yield of rapeseed, an experiment was done with four levels of drought stress including l1 (field capacity, fc), l2 (70% available water content, awc), l3 (50% awc), and l4 (30% awc), within three growth stages- including stem elongation (t1), onset of flowering (t2) and silique fo...