Peak phosphate

by frog

I followed the link to Farmgeek’s blog this afternoon and came across this fascinating post on phosphate asking if we have time to mitigate before we run out. It’s a month old now but incredibly important to our food security:

peak phosphate

Graphic from The Oil Drum

NZ currently uses about a million tonnes of phosphate fertiliser each year. Its use underpins our entire agricultural economy so in the context of global shortages of oil and other resources, it should play a big part of our discussions. According to the U.S. Geological Survey “There are no substitutes for phosphorus in agriculture” (organic and permaculture aside). We currently import 80% of our phosphate fertiliser from Morocco.

While Morocco has their name on the manifest of the bulk carriers that regularly stop off at Tauranga, Napier and Port Chalmers, the phosphate in fact comes from West Sahara. This region is under military occupation by Morocco and while the NZ government acknowledges the occupation is illegal, the importation of phosphate from Morocco is allowed.

Ethics aside, we don’t currently have too many options. Morocco controls two thirds of the world’s phosphate resources and are happy to do business with the West, but they themselves are facing “peak phosphate” in the near future. Just like oil, we are a small player at the end of a long, fragile supply chain. We are dreaming if we think we can keep importing it indefinitely in the face of a global shortage.

Farmgeek continues to discuss the small reserves of phosphate we have in New Zealand (Milton specifically).  I’m left with the impression though that our first response needs to be developing out capacity to farm without phosphate because those remaining supplies will only soften the slide.

This deposit could provide us with 10 years of self-sufficiency in phosphate if it proves viable to extract it. Once world phosphate supplies start to decline, they are gone forever so surely the smart thing would be to keep ours in the ground as long as possible, giving us a 10 year window to mitigate against peak phosphate by adopting new practices.

frog says

Published in Environment & Resource Management by frog on Thu, October 30th, 2008   

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