This book addresses the importance of irrigation and provides a theoretical and practical analysis of the same. It consists of a broad spectrum of topics and information based on agricultural water productivity in stressed environments and systems of irrigation practices across the globe which are extensively discussed and illustrated. The various topics elucidated in this book include impacts of irrigation on the physiology of plants, process of creation of drought tolerant variety, deficit irrigation practices and genetic manipulation, plant-water-soil-atmosphere relationships, agronomic practices in challenging environments, detailed account on the onslaught of global warming, agro-meteorological effects and climate change, casing practices for sustainable irrigation practices, etc. Therefore, with the aforementioned topics, the book efficiently examines the field of irrigation which is important for the sustenance of agriculture.