27Superphosphate fertilizers

27 Superphosphate fertilizers

(1)  A fertilizer is a single superphosphate if –

(a) not less than 7% of the fertilizer is water-soluble phosphorus; and

(b) not less than 8% of the fertilizer is phosphorus that is both water-soluble and citrate-soluble; and

(c) not less than 10% of the fertilizer is sulphur; and

(d) not more than 2.5% of the fertilizer is fluorine; and

(e) not more than 3.5% of the fertilizer is iron and aluminium as a mixed oxide; and

(f) not more than 2% of the fertilizer is iron as an iron oxide.

(2)  A fertilizer is a double superphosphate if not less than –

(a) 13% of the fertilizer is water-soluble phosphorus; and

(b) 15% of the fertilizer is phosphorus that is both water-soluble and citrate-soluble.

(3)  A fertilizer is a triple superphosphate if not less than –

(a) 15% of the fertilizer is water-soluble phosphorus; and

(b) 17% of the fertilizer is phosphorus that is both water-soluble and citrate-soluble.

(4)  Subregulations (1) , (2) and (3) do not apply to superphosphate that is mixed with another ingredient.