Rock phosphate and sulfur are imported mostly for making superphosphate, which is the main fertiliser used in New Zealand. It and urea are the only fertilisers made locally, but several others are also needed. Potash is used on dairy and cropping farms in the North Island and on the South Island West Coast, and compound NPK fertilisers are used in vegetables and forage crops (maize and brassicas) and in arable farming. Urea and sulfate of ammonia are used in dairying, vegetable production, arable farming and sheep and beef farming in both islands.
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