An Australian fertiliser company says it has already sold the entire urea output from its proposed plant, worth about $2.4 billion, before it has been built.The Australian Fertilizer Corporation plans to build a facility on the site of a defunct ammonia export project at the Port of Gladstone, about 530 kilometres north of Brisbane.Australian Fertilizer Corporation plans to develop a site in the Gladstone State Development Area. (Supplied: Queensland government)Chief executive Stein Haugan said the company secured contracts covering all of its planned production capacity of 220,000 metric tonnes of technical grade urea per year for the next 10 years."The…