Characterizations of some organic materials sources and analysis of the humic acids extracted from them
By: Awad, al-Sayyid Awad Muhammad; Dahduh, Salah Mahmud Muhammad; al-Itr, Wafa Muhammad Taha…[et al.]. Zagazig Journal for Agricultural Researches. Vol. 46, no. 3 (2019), pp.685-698, 14 p.
Subjects: Electron microscopes; Heavy minerals; Ion exchange; Molecular structure; Scanning electron microscopes