TY JOUR TI THE WORK OF THE ROW-CROP SEEDER VIBRATING DEVICE IN THE CONDITIONS CLOSE TO PRODUCTIVE FORM KW crops KW sowing device KW row-crops cultures KW nomogram KW relief KW sowing openings KW seeds KW sunflower KW seeding norm JO Bulletin of KSAU AU Vishnyakov, A.A. AU Vishnyakov, A.S. PY 2013 IS PB Krasnoyarsk State Agrarian University