The article describes the main merits of academician Ion Dicusar in the development of agricultural chemistry, in particular, plant nutrition with various forms of mineral nitrogen, in soil remediation and crop growth through fertilizer management, in the growth and preparation of a whole range of agronomists and researchers, more prestigious educational and research institutions from Russia and the Republic of Moldova. Through a series of examples of the most tumultuous period of life, Ion Dicusar is characterized as a scientist, professor and personality. Contains previously unpublished memories.