Book excerpt: The book deals with agroecological aspects of nutrients essential to crop production. A new concept termed 'AGROSPHERE' has been introduced in the book. A brief description about agrosphere, its expanse, contrasting features and interactions with other ecospheres, global nutrient dynamics and food production trends within various agro ecosystems forms the introductory chapter. The book encompasses discussions on the major agroecosystems/ cropping belts that contribute to global food grain harvests, fruits and other beneficial commodities.