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How many years is it going to take these greenfields projects to get into operation? Who knows, but investors buying for a long-term position should heed the words from New Zealand on Friday.

Peter Mourits of NZ's largest fertiliser supplier, Ballance Agri-Nutrients, made two points. One, there is no shortage of raw materials reserves and, two, new projects are well into the planning stages.

He didn't cite examples, but we can. Morocco and Western Sahara have enough known phosphate to meet the world's demand at present levels for 300 years. And big money is going into new production, including a new mine in Morocco (the so-called Saudi Arabia of phosphate). An Indian company is to spend $US1.5 billion ($1.6 billion) to build a fertiliser plant in Mozambique, a country with large known resources of phosphate. And another Indian company has teamed up with Singapore money to develop new mines.

It is true that phosphate is going to be in huge demand to meet world food needs. But it's a long way from grab samples to bagging the end product.