- (a) When any reference or claim is made on the label for secondary and minor plant nutrients, a specific percent (%) guarantee as the element shall be given in the guaranteed analysis.
- (b) The elements and the minimum amount of each that may be guaranteed shall be limited to the following, provided however, that the minimum or minimums may be lower for chelates of these elements upon specific authorization of the State Plant Board or its authorized representatives. Element . . . . . . . . . . . . . % Element . . . . . . . . . . . . . . % Calcium (Ca) 1.00 Copper (Cu) 0.05 Magnesium (Mg) 0.50 Iron (Fe) 0.10 Sulfur (S) 1.00 Manganese (Mn) 0.05 Boron (B) 0.02 Molybdenum (Mo) 0.0005 Chlorine (Cl) 0.10 Sodium (Na) 0.10 Cobalt (Co) 0.0005 Zinc (Zn) 0.05
- (c) An additional numeral or numerals referring to the guarantee of secondary or minor plant nutrients will not be permitted in conjunction with the usual N-P-K designations of a fertilizer grade.