TY JOUR TI EFFECT OF ORGANIC AND MINERAL FERTILIZERS AND ITS COMBINATION WHEN APPLIED TO POTATOES ON CHERNOZEM OF KAMA ZONE OF THE REPUBLIC OF TATARSTAN KW nutrition background KW potatoes KW tuber quality KW starch KW yield JO Vestnik of Kazan State Agrarian University AU Shaykhutdinov, F.. AU Serzhanov, I.. AU Garaev, R.I. AU Davletov, K.N. AU Nizamov, R.M. PY 2024 IS 19 PB Kazan state agrarian University