Question
Newport MI, 48166.  June 27 (yes-I should have waited til fall...couldn't take the mud anymore), I planted new lawn and am a beginner.Land graded, topsoil put down, seeded (KBG,RYE,FESCUE mix), straw(or hay) scattered about.No sprinkler system...manually 6 am and 8 pm daily.I'm pretty sure yellow nutsedge has taken over my front lawn and the back is coming in very scattered, side looks good.  I pulled a lot of the weeds manually over weekend...but the front is killing me...lime green color 'grass' all over.  
What can/should I apply on new lawn or should I just grin and bear the weeds this year?
What should water be daily/weekly as I have decent growth in some areas but seedlings or nothing elsewhere?
Any advice would be fantastic.  

Answer
I have enclosed a link to an article on yellow nutsedge. It says it better than I can:

http://ohioline.osu.edu/hyg-fact/4000/4010.html

When you sow new grass seeds, water frequently and shallowly to make sure that the soil is kept consistently moist (never allowed to dry out). This is required for seeds to germinate (sprout). If the seeds dry out then they die. When covered with straw, the watering frequency can be cut back slightly as the straw will help keep the soil damp, but do not underestimate the need for consistent watering. Watering twice per day is not unrealistic when planting new grass.

Once the new grass has germinated and grown in a bit, gradually change watering pattern from frequent/shallow to infrequent and deep, such as once per week for 1-2 hours. This change over should be done gradually.

Good luck.