even though I still stand by their site information Eggs reminded me of a better way to deal with the weeds in your dormant lawn. see the exchange in this thread between Eggs and myself concerning the use of glyphosate. glyphosate is the active ingredient in RoundUp® and is a kill all. neat trick though is how glyphosate will only be absorbed by what is not dormant therefore your dormant grass will not be harmed.
do not mow before applying and wait until you see yellowing in the weeds showing they have absorbed the glyphosate and are on their death bed. 5 to 7 days between application of any weed killer and a mowing is usually enough time.
Eggs is one who has displayed an understanding for these things and his advise is worth considering.
try not to get sucked in by the economically challenged persons and their not so great cost saving ideas concerning the use of cheap fertilizers.
best