[lsb]

https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/16/nrcs143_...

https://en.wikipedia.org/wiki/Bushel#Weight

A hectare is ~2 ac.

Wheat looks like 2-5 tonnes/hectare

Looks like 20 tons per hectare is pretty high, but

[hjalle]

It's 20 million tonnes per year according to the source https://www.unccd.int/actions/united-nations-decade-deserts-...