I didn't realise until recently the dependence on oil that food production has now developed.
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This is what would happen on my farm next week if oil ran out tomorrow.
Firstly, I would plant half my farm to lucerne based summer pasture. Southern and western parts of Australia would plant clover based winter pastures. 3 years of legume pasture would provide enough N for 3 years of crop. So straight away, there's production halved.
Secondly, I could grow my own biodiesel. In fact, I wouldn't do it myself, I'm sure a few farmers would get together and form a co-op, and do it in bigger scale. Using round up, and zero-till, it would take just 4% of my land area using the oil-seed crops, sunflower or canola. Oops, roundup is oil based, so it's conventional cultivation. So that would take 10% of my land area to grow the bio diesel because ploughing the soil takes much more energy than spraying.
However, I'm now only farming half my land, because half my land is in legumes producing N, so I'm now down to 40% production. That's just Nitrogen. Then there is phosphorus, sulfur, potasium, zinc. All need oil in their manufacture and transport. Oh dear.
There would be no farm chemicals, as they are all oil based. So I would take a massive hit from yield from weeds and bugs. Inter-row cultivation would be necessary. That's more energy and biodiesel needed. I'm back to almost organic farming now. I would get out the old hoe, and sharpen the blade. Just a few thousand acres to do.
Problem is, with global grain production slashed, there would be no grain to feed to animals. It would all have to go to humans. So there goes the source of organic fertilizer. All human fecal and urine waist would have to be carted back to the paddocks.
More energy and biodiesel.
Then the biodiesel needed to get the food into town.
There would not be much grain left in the end.
The end of oil would mean tiny permaculture plots in town and in backyards. The cities would have to disperse into the countryside and it would be back to 25 to 50% of the workforce being farmers, from say 2% today.
Australians would be OK, as we have plenty of land, but it would be untold famine and death and war in most parts of the world. Australia and New Zealand would survive. The US and Canada would too, untill they got swamped by starving refugees from the south. Europe is only just self sufficient in food now, but they would still be swamped from Asia and Africa. The Poms only grow 60% of their food now, even with oil, so no refugees would even bother crossing the channel as the Poms would have already starved.
See ya's.