TY JOUR TI THE PECULIARITIES OF POTATO CULTIVATION TECHNOLOGY IN THE FOREST STEPPE ZONE OF THE SOUTHERN URAL KW potato KW siderites KW level of balanced mineral nutrition KW planting density KW programmable yield KW seed fraction tuber harvesting JO Bulletin of KSAU AU Vasiliev, A.A. AU Zybalov, V.S. PY 2014 IS PB Krasnoyarsk State Agrarian University