"Franz Heymann" wrote in message
...

"Finance" wrote in message
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Clay is good soil packed badly.

That is not a very good characterisation of clay. A good soil has suitable
proportions of clay, sand (of various particle sizes) and organic matter.
There are actually good soils which have practically no clay at all.

Franz

Definition 1 :
Clay soils have a very dense soil structure. The particle size is extremely
small and there is very little open space between and around the particles.
Water enters and drains from clay slowly. Clay soils can be very fertile but
hard to work. Soils should have at least 35 percent by volume clay particles to
be classified as "clay".

Definition 2:
Includes 'working with' - 'plants to use' etc etc
http://www.bachmans.com/retail/tipsh...thClaySoil.cfm

Definition 3:
All clays are pretty well unworkable with ordinary implements. For the melted
toffee consistency of winter, you might prefer a large soup-ladle; for light
working over summer, a hammer and cold chisel. Is the soil always too wet or
too dry? No, there's a period - usually a day or two in May - when you can
actually use a fork.
- John Lucas, Backs to the Garden Wall

Jenny