United Kingdom 
On a small patch of ground I grow early potatoes each year. No crop rotation. The soil is kept fed with organic manure and artificial potato fertiliser. Crops are good.
But recently I noted a curiosity - there are no worms in the soil. Does this indicate the soil is in some way toxic?
9 Aug, 2013
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It isn't really a great idea to always grow the same crop on the same bit of ground though
10 Aug, 2013