Diagnosis is a critical process that requires careful observation of crops, thorough knowledge of crop behavior, and a complete understanding of the functions of nutrients and their deficiency symptoms. The diagnostic techniques used for different crops vary depending on the field conditions in which the deficiency occurs. In Indian agriculture, multiple nutrient deficiencies have emerged as a significant problem, necessitating the need for a comprehensive guide on the diagnosis of nutritional disorders and their correction in crop plants. The book has been written in a simple language to improve knowledge of the diagnosis of mineral element deficiencies essential for normal plant growth and the methods to remedy these deficiencies. The main feature of this book is the detailed description of the various visual deficiency symptoms exhibited by fruit crops. The book has been designed primarily for students of Horticulture and Agriculture to update their knowledge on nutritional and physiological disorders of fruit crops. It is also useful for extension workers and progressive farmers who are engaged in the profession of agriculture. We hope that this book will contribute significantly to increased fruit production by providing a suitable basis for the proper diagnosis and correction of nutritional disorders in fruit crops.