Or...
How big must be the vineyard to justify the purchase of a grape harvest machine?
check this links maybe help you
Article Evaluation of the mechanized harvest of grapes with regards ...
Article Technical and Economic Evaluation of Mechanical Grape Harves...
https://www.liveoakbank.com/wine-and-craft-beverage-resources/winery-and-vineyard-resources/vineyard-equipment-spotlight-mechanical-harvesters/
Article Impact of local conditions and machine management on grape h...
http://www.spiritedbiz.com/rise-machines-mechanization-comes-vineyards/
Check this link
https://www.winemag.com/2017/07/06/are-hand-picked-grapes-better-than-machine-harvested/
In Germany the vineyard should compass at least 100ha.
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