Weeds in new turf?

We have got new turf laid on 23-6-06. We were told by landscaper that they have put down new hard wearing rolawn. We are regularly watering it. Now for the few days weeds in the shape of mushrooms are appearing.
The lawn also shrunken at some places where layers of turfs are joined. What could be the reason and how to get rid it. I shall be grateful for your help and advice
Thanks
Zafar

Answers:
check with the people who installed.mushroom grow from spores in the air they should not be there unless they were alredy in the sod try pulling the mushrooms and bagging them . the sunken areas should have soil added to them untill level do it now.

Other answers:
water it
water it
not sure about the fungus but how are you watering the turf, is it possible that the soil underneath the turf where they join are being eroded. If you have a landscaper you should call him because anybody worth their salt will guarantee their work.
grass is generally grown in spent mushroom compost
shrinking is natural give it six months and the joints will go as the new grass grows
If this was a cheap job - then there's your reason. If you paid a fair price with a job guarantee - then call them back in. It's a poor,unprofessional job.
if they are hallucinogenic keep quiet and smoke them if not complain they arent
as for the shrinkage you need to water more the turf is drying out

are the weeds actually mushrooms if so it's probable that the turf was grown on old mushroom compost and some of the spores have survived

check first then eat they will die off soon

if it's other weeds then use a touch weeder to remove them don't use a spray or wait until the lawn is established then use a weed and feed for lawns

I would think you bought some cheap turf if not get them back
  • How wide is the narrowest a circle drive will fit in?
  • I have a realy awsom looking hen& chicks and would like to inter it in a contest, any ideas how to do this?
  • carnivorous plants in the midwest?
  • What's wrong with my pumpkin plants?
  • Who or what is 'Elmer Fudd'?
  • Is Rhubarb poisonous?
  • Exactly when are you to plant tomato plants? Asking this for a friend.?
  • Flowers for a beginner???