That should give you between 4 tons (for wheat) and 25 tons (for potato) of produce. Surely that's enough?
For potatoes, about 1 ton of (commercial) fertilizer would be required, and a lot of water (around 2,800m3 of water), which is fine if you live in the mid-west with lots of rain, less fine in the desert portions of California.
Also, US yield for wheat is ~45 bushels per acre, wheat is 60 lbs per bushel, for 2700 lbs. This is 1.3 tons, not 4.
And this is done with large scale, high yield processes that do not scale down to an acre.
Where did you get 4 tons?
https://www.statista.com/statistics/190356/wheat-yield-per-h...
As for diet: yield of carrots and many vagetables is usually higher than for wheat, but yes getting any real variery from that hectar would be unrealistic.
http://www.farmbusiness.co.uk/business/2019-farm-output-esti....
>Are we measuring different stuff?
Apparently.
Also, why use UK numbers to compare to a story on US agriculture, especially without mentioning you switched countries? Can I cite numbers from Congo without noting it?
>Surely yield in Uk can't be 3 times higher.
Sure it can - variation in wheat production has well over a 50x variation among countries. Not every country has the UK climate, or even the uniformity that the UK has. The climate and rainfall in the UK are very well suited to wheat production.
Also, I just posted the values. And here's [1] another place you can look. From this place you can select countries to compare them. The US is ~1/3 the output. The UK has exceptionally high numbers, nearly the highest in the world.
Pretty much every source I find is similar.
[0] https://www.allaboutfeed.net/Raw-Materials/Articles/2020/8/U... [1] https://ourworldindata.org/crop-yields
