Check for the work of Stefan Siebert at U Göttingen (Siebert, S., Kummu, M., Porkka, M., Döll, P., Ramankutty, N., Scanlon, B.R. (2015). A global data set of the extent of irrigated land from 1900 to 2005. Hydrology and Earth System Sciences 19, 1521-1545. DOI:10.5194/hess-19-1521-2015). He is probably the best contact to ask for such data.

Food and Agriculture Organization FAO has many databases of crop production. Try this one: https://www.fao.org/aquastat/en/data-analysis/irrig-water-use/irrigated-crop-calendars

Check https://www.fao.org/3/cb1329en/online/cb1329en.html

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Also check https://nue.okstate.edu/Crop_Information/World_Wheat_Production.htm

https://www.statista.com/statistics/263977/world-grain-production-by-type/

Irrigated agriculture currently produces about 40% of the world’s food from about 20% of the world’s cropland areas.

https://www.mapspam.info/

You can use something like this to calculate the totals for 2010 or by country. If I remember well we did this some years back for maize and wheat in CIMMYT. Let me check If still have this. If not it can be produced relative quick.

Here you go

Please visit

Article Multiple cropping systems of the world and the potential for...

https://www.nature.com/articles/s41467-021-21498-5

https://www.fao.org/3/cb1329en/online/cb1329en.html

https://apps.fas.usda.gov/psdonline/circulars/production.pdf