In article , Janet Baraclough.
.. writes
But is soil improvement not relevant to gardeners anywhere?

Yes, but how it's achieved in different countries/climates varies. Try
rec.gardens for an eyeopener..they call it soil amendment.

Soil improvement/amendment is carried out in various ways in all
countries and it is relevant to gardeners and to gardening everywhere.
--
Alan & Joan Gould - North Lincs.