It seems to me that the potato sizes are highly variable across the paddock, as well as the potato spatial yields (spatial dependence ~3 metres). Even we take tuber samples from multiple sites, they still don't represent the whole paddock well. The grower has suggested an app called 'PotatoSize', which calculates the proportion of tuber sizes based on the photos taken by cellphone. How about the practicality to retrofit a camera like this on-harvester to measure potato sizes on-the-go? 

http://www.hutton.ac.uk/news/potatosize-easier-way-estimating-potato-crop-size-distribution

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