Simultaneous thermal analysis of mineral fertilizers, purchased in Almaty Ilona Matveyeva, Nurgul Nursapina, Askar Bakhadur, Sholpan Nazarkulova, Balnur Shynybek and Oksana Ponomarenko BIO Web Conf., 30 (2021) 02009 Published online: 22 April 2021 DOI: 10.1051/bioconf/20213002009