This book is designed to provide simplified, concise, and up-to-date information on various aspects of agricultural sciences. Its primary objective is to help readers quickly and comprehensively grasp key concepts across different branches of agriculture. Now in its 26th edition, the text has been thoroughly revised, expanded, and updated to incorporate the latest questions, research findings, data, and technologies. We believe this book will serve as a valuable resource for teachers, researchers, and development officers, assisting them in addressing complex queries with ease. It is specifically tailored for aspirants preparing for competitive examinations such as NTA-CUET (Agriculture), JRF/NTS (PGs), Senior Research Fellowship (SRF), NTA ICAR-National Eligibility Test (NTA ICAR-NET), and Agricultural Research Services (ARS). Additionally, it will support candidates seeking admission to Ph.D. programs through entrance exams conducted by various State Agricultural Universities (SAUs) and institutions. Beyond academia, this book will also aid individuals preparing for screening tests conducted by state agencies for positions in agricultural sciences, civil services, agricultural officer roles, bank probationary officer (P.O.) exams in agriculture, Agricultural Development Officer (ADO) positions, and other related fields.