TY JOUR TI THE NATURE AND STRENGTH OF THE CORRELATION OF SPRING WHEAT YIELD WITH SOIL FACTORS IN CONDITIONS OF GRAY FOREST SOIL KW spring wheat (Triticum aestivum) KW gray forest soil KW productivity KW readily hydrolysable nitrogen KW content of mobile forms of phosphorus and potassium KW productive moisture KW correlation JO Vestnik of Kazan State Agrarian University AU Serzhanova, A.R. AU Gilyazov, M.. AU Shaykhutdinov, F.. AU Serzhanov, I.. AU Daminova, A.I. PY 2023 IS 18 PB Kazan state agrarian University