Mike Lyle wrote:
EagleEyes wrote:
The soil is very poor sand and clay...
http://www.lancs.ac.uk/postgrad/alves/pic/soil.jpg

any suggestion on how to cover it without putting more soil on top of
it? I am trying to find some grass or some very resistant ground covver
plant to cover 60sqm of this soil...

Grass will grow in worse places than that. [...]

Sorry: I forgot to say it would be a good idea to add some organic
material if you can get it. Those drying cracks will still appear once
you've turned it into a lawn, because your soil is almost entirely
mineral: it probably isn't curable within normal budgets, and it
doesn't necessarily matter, but even quite a small quantity of compost
or something will give you a better texture for growth.

--
Mike.