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Research into replacements for nitrogen-based fertilisers has been spurred by high prices and climate concerns.
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This BBC article looks at how rising fertiliser prices have affected global agriculture, noting that dramatic rises in fertiliser prices in the developed world may well be a good thing, in driving farmers towards alternatives, with chemical fertiliser potentially being seen as a demerit good.
However, it may be a bad thing in developing economies, where lower incomes, lower levels of demand may mean that chemical fertilisers are actually under-consumed. It also highlights the impact of the Sri Lankan ban on chemical fertilisers and the adverse effect that this has had on agricultural productivity there.