14556. 'Primary plant nutrient' means nitrogen (N), available phosphoric acid (P2O5), or soluble potash (K2O).(Added by Stats. 1990, Ch. 504, Sec. 2.)
California Legal Code
§ 14556
Source: https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=FAC&division=7.&title=&part=&chapter=5.&article=2.· Version 2026