TY CONF TI ON THE QUESTION OF FORMS AND METHODS FOR DETERMINING AVAILABLE FORMS OF SILICON IN SOIL KW silicon KW soil KW plant KW method KW spectrometry KW extraction. JO XIII All-Russian scientific-practical conference of young scientists «Achievements and prospects of development of the Russian agriculture", dedicated to the memory of R.G. Gareev AU Ibatullin, I.. AU Salimzyanova, I.. AU Lukmanov, A.. PY 2023 PB TRIA FRC Kazan Scientific Center of RAS