Water is an essential resource for agriculture, but harvesting water for irrigation is a major issue for farmers in developing and underdeveloped countries. This new volume addresses the challenges of repurposing wastewater in agriculture processes, with a special focus on low- and middle-income regions of the world. The book details the application of wastewater (treated and untreated) in agriculture and the latest and most economical techniques for making wastewater suitable for irrigation purposes. It also looks at the uptake of heavy metals and emerging contaminants by the irrigated crops, soil, etc., from wastewater. The book discusses utilizing water generated from rainwater harvesting systems, use of water quality indices for checking water suitability, the Internet of Agribot Things (IoAT) for wastewater applications, and more.