TY JOUR TI ECONOMIC EFFICIENCY OF TOMATO HYBRIDS CULTIVATION ON COCONUT SUBSTRATE IN WINTER-SPRING TURNOVER IN THE CONDITIONS OF DAGESTAN KW Republic of Dagestan KW tomato KW varieties KW winter-spring turnover KW protected soil KW hydroponics KW fruit weight KW fruiting KW yield JO Vestnik of Kazan State Agrarian University AU Akhmedova, P.M. PY 2020 IS 15 PB Kazan state agrarian University