Effect of granulation of superphosphates on movement of phosphorus and sulphur in two soils

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Abstract
Superphosphate has been, and still is, the principal phosphorus fertiliser used in New Zealand. About 4 million ha are topdressed in the North Island and 2 million in the South Island. Diammonium phosphate, triple superphosphate, and other imports contain less than 0.5% of the P applied. Fortunately, the calcium sulphate in superphosphate has prevented sulphur deficiency on free-draining soils becoming serious. Now that the significance of S is recognised (Ludecke 1969; Metson 1969), widespread deficiencies caused by the use of fertilisers lacking S are less likely to arise. N, P, and K are registered under the New Zealand Fertilisers Act, 1960, but not S.

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