TY JOUR TI PRECURSORS AND NUTRITIENT STATUS EFFECT ON THE YIELD OF HARD SPRING WHEAT IN THE URAL ORENBURG ARID STEPPE KW wheat KW precursor KW rotation KW crop rotation KW background KW yield JO Bulletin Samara State Agricultural Academy AU Maksyutov, N.A. AU Zorov, A.A. AU Skorokhodov, V.Y. AU Mitrofanov, D.V. PY 2020 IS 5 PB Samara State Agrarian University