Question
I have a 3 acre lawn of mainly St Augustine (about 70% effective coverage).  Lots of trees and some hedges break it up and provide considerable shade.  I just moved in last summer and the lawn tractor I inherited "scalped" the lawn before I could figure out the height adjustments.  This left several browned out and bald areas.  This fall I added 200 lbs of annual rye grass because I was taught many years ago that this type of treatment can enhance lawn appearance in subsequent two years.  Now a friend tells me that the annual Rye will likely "poison out" all the St Agustine.  Location is North-Central Florida area, semi- to heavily sandy well drained soil.  Your thoughts on this scenario?

Answer
Good afternoon Ken:
This is a follow up to your last question:
Since my last corespondence with you I have done some more research on warm season grasses. As I had indicated to you I was not up on warm season grasses such as Bermuda. I have found that overseeding warm season grasses with a cool season Annual Ryegrass is a recommended practice. This allows you to achieve a green lawn throughout the year.
Both Perennial and Annual Ryegrass can provide a winter green lawn overseeded on warm season grasses that go dormant in the fall and winter.
Annual Ryegrass is one of the few seeds that can be sown without the hassle of tilling, scarifying, or digging into the soil and destroying any of the permanent ground covers already in place. Watering the yard and applying fertilizer before or after sowing are the main two steps in fastest establishment. The trick to sowing any seed is to get an even coverage in conjunction to sowing the correct amount to achieve an even lawn appearance as the grass fills in. And to get the seeds to make "soil contact" for germination to occur.
I hope I have not misled you with my first response.
Have a good lawn
Floyd McMahon