Effect of zeolites on soil modification and productivity Liliya M.-H. Bikkinina, Vladimir O. Ezhkov, Ramil N. Faizrakhmanov, Rasim R. Gazizov and Asiya M. Ezhkova BIO Web Conf., 17 (2020) 00117 Published online: 28 February 2020 DOI: 10.1051/bioconf/20201700117