turfing after usind sodium chlorate weedkiller

No, I would not think you can lay turf, or grow anything else, on this ground for at least a year. Sodium chlorate is a total weedkiller that resides in the soil for a long time.

Agree with Bulbaholic, sorry. be a waste of time trying to grow anything at all for a year at least.

I agree with Bulbaholic - Sodium Chlorate is toxic to humans and animals and depending on how much you used can reside in the ground from 6 months to 5 years. All I can suggest keep any children off it and contact the manufacturers helpline for further advice. Good luck

Buy 300 bottles of pickled onions.
Strain off the fluid into a seperate container and spray over the lawn area. The acid (vinegar) will neutralise the Sodium Chlorate, but poisonous fumes will be released, so choose a windy day for maximum dispersal.
The onions you will need to consume fairly rapidly, so to avoid digestive problems, give many to friends.
There are more volatile mixtures that can be used, for quicker results, but I would advise a chat with your local arboriculturalist.
Of course, as with the SC, your biggest problem will be the wash-through residue after it rains!

Pickled onions - how daft is that?

You didn't say what size bottles! ;-)

SJT - it's all about Chemistry.
Size of bottles? Well, it depends on how keen you are on pickled onions really.
Alternatively, with alot of vingar, you can boil it down to concentrate the acid.
Of course, if you want something a bit more explosive, a good chemist will do you a "SoS" solution, that will really get things going, but I don't feel it appropriate to reveal such information in the public domain.
Chemistry - it's as simple as that.