TY JOUR TI THE NEUTRALIZED PHOSPHOGYPSUM AS GYPSUM-CONTAINING MELIORANT RUSSIAN CASE-STUDY KW phosphogypsum KW soil fertility KW high-alkaline soil KW nitrogen KW phosphorus KW potassium KW fertilizers KW soil structure KW gypsum-containing meliorants JO INTERNATIONAL AGRICULTURAL JOURNAL AU Akanova, N.. AU Vizirskaya, M.. AU Seregin, M.. AU Grebennicova, T.. PY 2019 IS 2 PB Electronic science