TY JOUR TI THE BIO-STIMULATOR APPLICATION FOR IMPROVING THE QUALITY OF LETTUCE GREEN MASS KW lettuce KW bio-stimulators KW moisture mode KW irrigation mass KW vegetative mass KW ascorbic acid KW efficiency KW vegetation experiment JO Bulletin of KSAU AU Zhirnova, D.F. PY 2014 IS PB Krasnoyarsk State Agrarian University