The cultivation of horticultural crops is fundamental to global food security and the economic well-being of millions of farmers and industries. However, the successful production and quality of these crops are profoundly influenced by physiological disorders and nutritional deficiencies. Understanding these challenges, along with strategies for their prevention and management, is critical for sustaining high productivity, improving crop quality, and ensuring environmental sustainability.This textbook, Physiological Disorders of Horticultural Crops, aims to provide a comprehensive guide to the causes, symptoms, and management of these critical issues. The book brings together foundational knowledge and the latest research to equip students, researchers, and practitioners with the tools they need to identify and address the physiological and nutritional challenges in horticultural systems.The book is organized into several key sections. It begins by introducing the physiological processes in horticultural crops and the role of essential nutrients in their growth and development. Subsequent chapters delve into specific physiological disorders and nutrient deficiencies, exploring their causes, symptoms, and impacts on crop yield and quality. The interplay between environmental factors and plant physiology is emphasized, highlighting how climate, soil conditions, and cultivation practices contribute to the emergence of these problems.