The Comparative Efficiency of Organic, Mineral and Organo-Mineral Fertilizers for the Winter Wheat Grain Yield in the Forest-Steppe of the Volga RegionAlevtina Kulikova, Evgeniy Yashin, Alexander Karpov and Elena VolkovaBIO Web Conf., 37 (2021) 00094DOI: https://doi.org/10.1051/bioconf/20213700094