re: Somewhat newly laid St. Aug (maintenance question for board experts)

you can basically ignore the nitrogen fertilizer recommendations on the soil sample report. Use a moderate to high nitrogen fert (nitrogen being the first number in the XX-XX-XX format printed on the bag). Nitrogen content should be anywhere from 15-30, though I typically like to stay around 15-20 to reduce risk of burning the lawn. Some amount of slow release nitrogen is preferable as well. Try to find a fert that has approx 3-1-2 or 4-1-2 NPK ratio. Use 1lb of nitrogen (which is not equivalent to 1lb of fertilizer FYI) per 1000sq ft of lawn. What area are you in? If acadiana or BR area, people can give you specific fert recs from certain vendors.

Ignore the potash at this point, that was a fall-season suggestion to "winterize" the lawn in preparation for winter.