I'm new to the site but have read quite and bit and now looking for some feedback on a maintenance plan for my lawn. Here are the details:
- Located in Columbus Ohio
- Lawn is about 15K sq ft and was newly sodded in fall of 2013 with KBG mix from a commercial builder but now see some thicker bladed clumpy invasive grass starting to find it's way in
- Have irrigation system with Rachio controller
- Have used local lawn care company for past few years that fertilize, weed control, etc, but this year trying to do myself. At the end of March I applied Menard's brand fertilizer with crabgrass control at 0.88 N, 0.00 P, 0.10 K pounds per 1000sq ft.
- Had a soil test done with the following results:
---pH level = 7.9 which they call "above optimum"
---Phosphorus = 2ppm which they call "below optimum"
---Potassium = 91ppm which they call "below optimum"
---P lb/A = 4
Exchangeable Cations (meq/100g)
------Acidity = 0.00
------K = 0.23
------Mg = 4.86
------Ca = 29.10
------CEC = 20.1
% Saturdation of the CEC
------K = 1.2
------Mg = 24.2
------Ca = 74.7
Calculated Nutrient Needs, lb/1000 sq ft/yr
------N = 1 to 4
------P = 4.5
------K = 2.0
Milorganite seems like a good solution to provide Nitrogen & Phosphorus, however doesn't have any Potassium.
Whereas normal Scotts & house brand fertilizers provide Nitrogen & Potassium, however they don't contain Phosphorus.
It appears starter fertilizers have all 3 key ingredients, but are lower in Nitrogen. And would they be safe for an established lawn?
All that being said, I haven't found a single fertilizer available that would deliver the recommended Phosphorus & Potassium needs for the year with only 4 applications.