Abstract
Water scarcity and the increasing global demand for water in many sectors, including agriculture, has become a global concern .The rapid growth world population and the adverse impacts of climate change lade to growing computation for water use by industrial and urban users for agriculture to secure enough food. Irrigated agriculture is an important role in total agriculture and provides humanity with wide range of agricultural products, including fruits, vegetables, grains and cereals. Effective management of water use is the only way to save water for the increasing irrigated agriculture. Different approaches have been adopted to reduce the damage caused by drought; among these approaches is water productivity or water use efficiency WUE. A crop with high WUE should have greater yield than crop with low WUE. Keywords : water use efficiency, drought, irrigated agriculture, plant improvement DOI : 10.7176/JNSR/9-23-03 Publication date: December 31 st 2019
Highlights
Water productivity is the ratio of the net benefits from crop, forestry, fishery, livestock and mixed agricultural systems to the amount of water used to produce those benefits
Improving water use efficiency or enhancing agricultural water productivity is a critical response to growing water scarcity, including the need to leave enough water in rivers and lakes to sustain ecosystems and to meet the growing demands of cities, industries and crop yields
Irrigation scientists and engineers have used the term water use efficiency to describe how effectively water is delivered to crops and to indicate the amount of water wasted at plot, farm, command or system level and defined it as “the ratio of irrigation water transpired by the crops of an irrigation farm or project during their growth period to the water diverted from a river or other natural source into the farm or project canal or canals during the same period of time
Summary
Water productivity is the ratio of the net benefits from crop, forestry, fishery, livestock and mixed agricultural systems to the amount of water used to produce those benefits. Irrigation scientists and engineers have used the term water (irrigation) use efficiency to describe how effectively water is delivered to crops and to indicate the amount of water wasted at plot, farm, command or system level and defined it as “the ratio of irrigation water transpired by the crops of an irrigation farm or project during their growth period to the water diverted from a river or other natural source into the farm or project canal or canals during the same period of time This approach was further improved by introducing the concepts of uniformity, adequacy, and sagacity of irrigation. Still this concept of water use efficiency provides only a partial view because it does not indicate the total benefits produced, nor does it specify that water lost by irrigation is often reused by other users (Seckler et al, 2010)
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