Potato harvests have suffered in different ways this year. Hear the early part of this pod cast.
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The GGI method
Potato harvests can be increased against water shortages and disease with top soil being increased with good quality compost. Major change could be effected by not spraying off the potato haulm after harvest, with Sulphuric Acid, and using it to make fertiliser/soil conditioner for the next season (as we do). So far this doesn’t happen in mainstream potato production.