Define water use efficiency. Describe factors affecting water use efficiency

Water use efficiency (WUE) is defined as the amount of carbon assimilated as biomass or grain produced per unit of water used by the crop. One of the primary questions being asked is how plants will respond to a changing climate with changes in temperature, precipitation, and carbon dioxide (CO2) that affect their WUE At the leaf level, increasing CO2 increases WUE until the leaf is exposed to temperatures exceeded the optimum for growth (i.e., heat stress) and then WUE begins to decline. 

Factors affecting irrigation water use efficiency

Many factors affect WUE in the irrigation sector. They include seepage, percolation, soil depth and texture, evaporation and evapo-transpiration, design of irrigation structures and their operation and maintenance, and management skills. At various efficiency levels, climate and rainfall patterns, size of irrigated areas, and methods of water application ________ ________ ____ ________ _________ __________.
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