You use the UBar to loosen soil below the depth you have excavated withTo this:
your digging spade and spade fork, i.e. loosened/tilthed in situ but not
inverted, left in place. This is the process followed periodically after
the beds are done and you need to tilth them seasonally or between
crops; inverting the soil is not done then or ever after initial bed
construction. The UBar can be used from the start to make double digging
go faster and it is generally a good idea to use it throughout as long
as you do not compromise the double digging process,
which is orderly for a reason, efficiency and thoroughness of tilthing.
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