part 2:
Nutrients other than nitrogen, phosphorus, or
potassium are voluntarily listed on the label under the
“guaranteed analysis” section and the values listed
represent the actual percentage in the fertilizer. To be
listed on the label, they either have to reach a minimum
level, which are: (Ca at 1%, Mg at 0.5%, S at 0.5%, Fe at 0.1%, Mn,
Zn, Cu at 0.05%, B at 0.02%), or they can be in the
fertilizer but left off the label, or the label can contain
“For continuous liquid feed programs” which exempts the
fertilizer from the minimum critical level on
micronutrients