Yep, saw those weblinks earlier, but always good to give newbies a heads up. I got to agree on your strategy to try and show success in ammonia [N] first--it will be the most difficult, huge flowrate to postPeak sustain if financing is mostly kaput and natgas goes belly up. P & K will mostly just sit in the soil until used [unless washed away], but N leaches and/or gas volatilizes away at a much faster rate--a real Red Queen treadmill of diminishing returns as our topsoil continues to deplete.

Just in case you missed this recent UN FAO PDF link:

ftp://ftp.fao.org/agl/agll/docs/globalfertdemand.pdf
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Forecasting Long-term Global Fertilizer Demand 2015,2030

[TABLE 3] North America N-only forecast: 2015 = 21.2, 2030 = 28.1
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Your article said we used approx. 17.0 in US ag last year and Domestic ammonia production was 10.7 million tons in 2007.

I think you got a hell of a lot of postPeak US work ahead to meet this demand if there is insufficient natgas and coal for making N, then insufficient crude to get it transported for the final topsoil square foot application. For example: You got just six years to DOUBLE N-production if our N-imports are cutoff for some reason on Jan. 1, 2015. Don't forget that Germany cut us off from K back in 1914-1918.