In article ], ] says...
What's the most efficient way of growing apples in terms of yield per
unit area of land?
Big trees? Cordons? Espaliers? Supercolumns?
Or what?

Its lots of smaller trees apparently, least ways that's what gets planted
these days.
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea