The study of the suitability for use in agriculture of sludge and hydrochemical indicators of water in the reservoirs of the fish farm LLC “Albashi”Natalya Yurina, Denis Yurin, Irina Astakhova, Tatyana Shcherbatova and Igor ShcherbatovE3S Web Conf., 175 (2020) 02001DOI: https://doi.org/10.1051/e3sconf/202017502001