This book provides information on role of essential nutrients in crop plants, predisposing factors for occurrence of deficiencies, risk and management strategy in major cereal crops namely rice, wheat and maize. An attempt has been made to provide scientific knowledge on the role of adverse climatic and other related factors in development of physiological disorders of major vegetable and fruit crops. Diagnostic symptoms, causes and management of each of the disorders have been described. Colour photographs greatly aid to identification. This book will prove a useful guide to undergraduate students of Agriculture & Horticulture, researchers and extension workers.