TY JOUR TI Selection of new forage crops for cryolithozone conditions KW cryolithozone KW non-traditional forage crops KW leaf area KW leaf area index KW photosynthetic potential KW net photosynthetic productivity KW yield KW forage mass JO INTERNATIONAL AGRICULTURAL JOURNAL AU Osipova, V.V. AU Ustinova, V.V. AU Platonova, A.Z. AU Kardashevskaya, M.I. PY 2026 IS 0 PB Electronic science