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Once here, I have shifted Ralf's question...

Hi, Ralf
Plant since I bucket always great with different Knollengroßen run the individual plants not all at the same time on.
This means that I do not always at the right time can begin to pour. While I'm watching: full pour only when the sheet is fully unfolded. Fertilize only when the leaf is unfolded. This is true even for seeds! Water before the leaf is unfolded only with the coffee spoon! Otherwise, my tubers are not particularly challenging. Such as the Earth is only secondary. But more must be fertilized in pure mineral substrate (if the blade is deployed).
So the suspicion: too much water, fertilized too early too cold after transplanting. Left ends to cold - if I wants to delay for the purpose of pollinating a flower I will kick the tuber in slightly moistened Earth this is the further development delayed immediately.
Michael says somewhere "because I always very early pot"... This should be a law! Bring the tubers in pots before they begin to develop. So there is no break in the development of the plants.
PS pot: the temperature in the clay pot is lower than the temperature inside the plastic pot. For this, the water flow in the plastic pot is more sensitive than in the clay pot.

Greeting
Klaus