TY JOUR TI STUDY OF THE EFFECT OF PLANTING SCHEMES AND GROWTH REGULATORS ON ICE SALAD PRODUCTIVITY KW Iceberg lettuce KW green crops KW growth regulators KW Epin-Extra KW Zircon KW Fitosporin-M KW planting scheme KW plant density KW yield KW product quality KW open ground KW biological products KW vegetable growing KW and cultivation technology JO INTERNATIONAL AGRICULTURAL JOURNAL AU Sokolov, A.A. AU Travkina, A.R. PY 2026 IS 9 PB Electronic science