On 14/12/14 15:35, 'Mike' wrote:
Thanks Bob. It is actually volcanic soil I am interested in improving,
but we have a heat and lack of water problem. My very inexperienced
thoughts are that the compost would add body.

Compost in the soil definitely helps to hold water there and compost on
the surface as a mulch helps to prevent evaporation.

Some crops benefit more than others. After digging in compost and manure
this year, I got the biggest celeriac ever on allotment!!