Veselov A. P. RussiaNizhny NovgorodNizhny Novgorod’s Lobachevsky State University, 23 Gagarina Av., Nizhny Novgorod 603950, Russiaeselov@bio.unn.ru Author's articles PHYTOPROTECTIVE EFFECT OF AMMONIUM HUMATE AT HIGH COPPER CONCENTRATIONS IN THE ENVIRONMENT