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Per plant - in 2011 I got between 4-8 Big spuds per plant and a further 3-4 smaller spuds all Kestrel potatos.
This year I got maybe 1 big spud on every other plant, and 4-5 smaller ones... All my veg strips on my allotment are 1.5m wide - spud plot was 10m long each year...
Last year 2 wheelbarrows full, this year 3/4 a wheel barrow.
Based on farming stats - perhaps 5-8kg per Sqm - If your client is doing the growing and is inexperienced, and the weather is bad again next year, expect more like 2-3kg per sqm.
It does however depend on the quality of the seed and the variety and all the other variables as described above ie water, sunlight temprature were about in the coutry your growing them ?
In any event, I would have thought that 180sqm will produce far more spuds than your client can eat and/or store for domestic use.
Well he might like lots of spuds =]
I hope so. Going on David's worse case scenario he/she would be producing enough for about 1Kg/day. Assuming two consumers that's a lot of spud to be getting down one's (or two's) neck and they would have to eat a lot more than that (or give some away) because they wouldn't store for a year.
Just back from my allotment and did the math - (just dug up the last of my potatos) - This years bad weather, I've got 3.5kg per Sqm - So I hope robs customer like potatos, as that is 110% of their annual calorie intake sorted!
As described by the other respondents there are a lot of variables such as variety, planting rate and planting date. There is a lot of information for commercial crops which can give you want you want in broad terms eg from the potato council publication
http://www.potato.org.uk/sites/default/files/%5Bcurrent-page%3Aarg%...
For instance this enables calculation of average yields for maincrop potatoes over the last 10 years (46.5 tonne per hectare)
With a commercial planting rate of 1 tuber per .75 m2 this implies 3.36kg/ tuber planted
In domestic gardens the planting rate is generally higher (maybe tuber / .33 m2 with correspondingly lower yields /tuber may be expected.
see also
http://www.thompson-morgan.com/how-to-grow-potatoes-in-the-ground
hope this helps
Terry McBurney