Study of chemical (macroelement) composition of plants growing in Kostanay Region Saule Mukhtubayeva, Anar Myrzagaliyeva A.B., Moldir Zhumagul, Adamzhanova. Zh.A and Rustemova A.D. BIO Web Conf., 100 (2024) 04042 Published online: 08 April 2024 DOI: 10.1051/bioconf/202410004042