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Old June 4, 2020   #6
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,451

I'm not a potato veteran, mostly what I read, but things are kinda like this:
Some tuber for the plant to feed from at first is beneficial to yield. (so just cutting small pieces is not ideal).
The amount of eyes (place where it sprouts from) increases fast with tuber size but reaches a plateau fairly quickly, so kinda like a 100g potato and a 300g one will have almost the same number of eyes.
Around 50-60g/seed potato is kinda ideal. Or half a 100g one. (I'm guessing this might depend on variety)
Too many eyes is also not good, as the number you get increases but size goes down (total yield goes a bit up though).
And don't forget to have a good amount of K in your fertilizer.
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