Crop Physiology is a comprehensive text that explores the fundamental principles governing the growth, development, and productivity of crop plants. The book covers physiological processes such as photosynthesis, respiration, transpiration, water and nutrient relations, plant hormones, stress physiology, and yield formation. It explains how internal plant mechanisms interact with environmental factors—like light, temperature, water, and soil nutrients—to influence crop performance, providing insights into optimizing agricultural productivity under varied conditions. The book also emphasizes practical applications,  including techniques for improving crop management, stress tolerance, and resource use efficiency. Additionally, modern topics like molecular physiology, climate resilience, and precision agriculture are integrated to reflect current research trends. This book is ideal for students of agriculture, plant sciences,  horticulture, and crop production who seek a deep understanding of plant physiological processes. It is also valuable for researchers, agronomists, extension officers, and crop consultants aiming to improve productivity, resource efficiency, and crop management strategies. Policymakers and agricultural planners can also benefit from its insights for developing practices that enhance sustainable agriculture and food security.