%0 Journal Article %T Biological productivity of ultra-early corn hybrids in various soil and climatic zones of the Ural region %A Panfilov, A.E. %A Zezin, N.N. %A Ovchinnnikov, P.Y. %K corn, ultra-early hybrids, soil and climatic zones, heat and moisture resources, biological productivity, crop structure, exchange energy, starch %J Agrarian Bulletin of the %D 2022 %N 218 %P 12 %I Ural State Agrarian University