Turf Fertilization & maintenance
I did a U of DE soil test which showed the ph on my lawn is 7.6 with excessive amounts of magnesium and calcium. The instruction was to apply 3 lbs 35-0-5 per 1000 sq ft. Should I also add aluminium sulfate? If so, how much for 1,500 sq ft. Can we fertilize, adjust ph, & overseed at the same time? I should also say that we purchased our 1985 home in Rockville about 2 years ago. The previous (& only) owners had a lawn service contract for everything but it is doubtful whether either the owners or the lawn service ever did a soil test.
At this point, we do not recommend lowering the pH. The pH will gradually lower over time with our acid rainfall. It is best to concentrate on fertilizing and overseeding to thicken your stand of turf. This can be done at the same time. Provide good seed to soil contact for germination. Look for recommended tall fescue cultivars if your lawn is in full sun to part shade. See fine fescues if your turf is in the shade. Hard fescue is recommended.
Follow the U of MD fertilizer recommendations for timing and amount of fertilizer. Lawn fertilizers now sold in the state are formulated to comply with the lawn fertilizer law. Lawn maintenance fertilizers have zero phosphorus in them and contain at least 20% slow-release nitrogen. Here is our fertilizer schedule and more about fertilizing. http://extension.umd.edu/hgic/umd-extension-lawn-fertilizer-schedule-home-lawns