TY JOUR TI MIXING UNIT FOR CONTROLLED CULTIVATION OF PLANTS IN PROTECTED GROUND KW protected ground KW mortar unit KW sam-pler KW nutrient solution KW acidity KW conductivity KW efficiency JO Bulletin of KSAU AU Dolgikh, P.P. AU Trepuz, S.V. PY 2017 IS PB Krasnoyarsk State Agrarian University