This book is a guide to achieving optimal crop yield while ensuring the sustainable and efficient use of water resources. It delves into critical topics such as irrigation water management, global and regional climate variability and change, food security, water pollution, soil erosion, and fertility loss. With the growing stress on water resources, the emphasis needs to be on environmentally friendly alternatives, including cutting-edge solutions like AI-based approaches, sensor-driven automation systems, and the integration of IoT in irrigation automation. This book collates information and analyzes current challenges in agriculture but also proposes innovative solutions, particularly in the context of the interconnected factors of water, crops, and climate change. By offering insights and strategies, it aims to guide the development of a water-wise, sustainable agriculture system that ensures the safety and well-being of future generations. This book is a valuable resource for anyone involved in agriculture and related fields, providing knowledge and tools to create a resilient and efficient food system. The target audience is diverse, ranging from farmers and students to researchers, scientists, irrigation practitioners, decision-makers, professors, and policymakers.