Question
I have applied fertilizer over the past couple of years, typically, spring, summer and fall.

I use an in ground sprinkler system and typically water 3 days per week - 20 minute intervals.

This summer, my clover problem was getting pretty bad, so I purchased fertilizer with wead control.  The instructions said to apply on wet grass and then not water for 2 days to allow the weeds to be addressed.

I did exactly as the instructions advised and now my yard is turning yellow/brown.  Obviously the fertilizer is burning my grass.  It is very hot (upper 90's) and humid.  I am trying to water heavily now to save it.  Is there anything else that I can do?  I am desperate not to lose my sodded lawn.

Answer
I do not recommend that you fertilize your lawn when daytime temperatures are above 80F and I do not recommend the use of broadleaf herbicides (such as weed-and-feed product) when daytime temperatures are above 85F. You are doing the right thing. In future, use the broadleaf weed control products (w/fertilizer) in late spring or early fall. Never in summer. You should not fertilize your lawn in summer either unless you have warm season grass (in the south).

Evenso, I prefer to use a spray bottle (like Ortho's Weed-B-Gon) instead of herbicides mixed with fertilizer. But still do not apply when temperatures are too hot.

In the north, with cool season grass, fertilize in late spring, early fall and late fall.

FYI, the recommended way to water a lawn is to water infrequently and deeply (within reason). E.g. it is better to water once per week for 1 hour instead of 3 times per week for 20 minutes. Gradually change your watering pattern to infrequent and deep. In very hot months, you can water twice per week, but make sure you still water deeply.