The efficiency of using different fertilization systems in dryland and irrigated crop rotations on ordinary carbonate chernozems of the Central CiscaucasiaTamara Bizhoeva, Ruslan Bizhoev, Asiyat Sarbasheva, Olga Batyrova and Aslanbek KushkhabievE3S Web Conf., 262 (2021) 01011DOI: https://doi.org/10.1051/e3sconf/202126201011