K. R. Krishna, PhD, is an agricultural scientist. He has authored several books on international agriculture, encompassing topics in agroecosystems, field crops, soil fertility and crop management, precision farming, and soil microbiology. His more recent titles deal with topics such as agricultural robotics and drones and satellite guidance to improve soil fertility and crop productivity. Dr. Krishna is retired from the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) in India. He is a member of the International Society for Precision Agriculture, American Society of Agronomy, Soil Science Society of America, Ecological Society of America, Indian Society of Agronomy, and Soil Science Society of India.