| http://www.w3.org/ns/prov#value | - The Haber process requires hydrogen as well as nitrogen, and that hydrogen is mostly obtained from natural gas.Which is to say, the cost of ammonia fertilizer can be expected to become significantly higher if/when the price of natural gas increases.Although I suppose that fossil-fuel input makes the use of natural fertilizers (like dung) as well as use of crop rotation with legumes more attracti
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