Evaluation of the air-dry mass of vetch-cereal grass mixtures according to their optimality in the ratio of neutral-detergent (NDF) and acid-detergent fiber (ADF)A S Skamarokhova, N. A. Yurina, N. A. Bedilo, D. A. Yurin and Y N AshinovE3S Web Conf., 224 (2020) 04030DOI: https://doi.org/10.1051/e3sconf/202022404030