The easiest way to find which structure group your soil is in, is by
testing it in an old coffee jar - take the label off as you will need
to see through it.
Let's assume that you soil looks the same in all parts of the garden,
and seems to be roughly the same sort of texture to the full depth of
a garden spade. Take a couple of typical spoonfuls; break it up as much
as you can, then fill half the jar. Fill the jar with water to within
a cm of the top and give it a really good shake. Keep shaking until all
of the soil has 'dissolved' and you just have a murky-looking liquid.
Leave the jar somewhere to let the contents settle; this will take a
few hours.
After a few hours, you should now have several layers of 'soil' types
in your jar. At the bottom will be the stone/sand layer, then a 'silt/clay
layer, followed by an organic layer. Right at the top the will be a settling
of clay. From largest to smallest, the particles are... stones, sand,
silt, clay.
etc etc etc
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