Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
This document provides a good overview of the importance of improving water use efficiency in respect to irrigated agriculture. Furthermore, this paper contains many useful definitions, such as water use efficiency and deficit irrigation.
BOUTRAA, T. (2010): Improvement of Water Use Efficiency in Irrigated Agriculture: A Review. In: Journal of Agronomy: Volume 9 , 1-8.