Re: Weed Prevention on a Large Yard
You will be making a huge mistake to apply weed-n-feed anywhere but the lawn that you want to keep manicured.
Pasture grasses, left to their own devices grow slowly and won't need maintenance cutting very often. If you fertilize it, however, it's going to grow exponentially, and instead of just the area around the house needing to be done regularly, you're going to have 4 acres to cut. This will be a huge pain in the behind, if farming/maintenance is not your thing.
I would recommend either getting an animal to munch the grass for you, or see if a local farmer would be willing to either cut it periodically or graze his animals on it from time to time.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!