Prof. Dr. Kelin Hu is a Professor at the College of Land Science and Technology, China Agricultural University, Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture and Rural Affairs, Beijing, China. He earned his Ph.D. at the China Agricultural University in 2000. He is also the director of the Education Committee of the Chinese Soil Society. His research field focus is on (1) soil physical processes and environment; (2) spatiotemporal evolution laws of soil quality; and (3) soil–crop system water and nitrogen management model and its application.