TY JOUR TI PRODUCTIVITY OF WHEAT (POLBA) OF RUNO VARIETY AT VARIOUS LEVELS OF MINERAL NUTRITION, SOWING NORMS AND DEPTH OF SEEDS FINISHING IN THE KAMA PRECKALM ZONE OF THE REPUBLIC OF TATARSTAN KW sowing rate KW seeding depth KW productivity KW wheat polba. JO Vestnik of Kazan State Agrarian University AU Shaykhutdinov, F.. AU Serzhanov, I.. AU Ibyatov, R.. AU Zinnatullin, D.H. AU Valiev , A.. PY 2018 IS 12 PB Kazan state agrarian University