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For an established Kentucky 31 lawn in Kentucky, choose a fertilizer by its nitrogen percentage and your soil-test results—not by a supposedly universal NPK ratio or brand. University of Kentucky guidance lists 2–4 pounds of nitrogen per 1,000 square feet per year for tall fescue, applied in autumn; its current turf schedule varies by maintenance level. Garden beds need crop-specific advice, so there is no single lawn-and-garden fertilizer recommendation.
Does Kentucky 31 need a special fertilizer?
No special Kentucky 31 formula is established in the cited guidance. The University of Kentucky describes Kentucky 31 as better suited to low-maintenance or utility turf, while turf-type tall fescues are preferred for lawns. Its fertilizer recommendations cover tall fescue or cool-season turf generally, rather than prescribing a separate blend for Kentucky 31. See the university’s Kentucky lawn-establishment publication and AGR-1, Lime and Fertilizer Recommendations.
For tall fescue, Kentucky Extension’s AGR-212 gives an annual nitrogen range of 2–4 pounds per 1,000 square feet and recommends autumn application. The publication year was not confirmed in the retrieved listing, so use that range alongside the newer AGR-1 timing guidance rather than treating it as a Kentucky 31-specific prescription: AGR-212.
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How much and when should you fertilize?
AGR-1 (2025–2026) organizes cool-season turf applications by maintenance level. It gives a range of 0–1.5 pounds of nitrogen per 1,000 square feet per application. Low- and medium-maintenance schedules are suitable for many home lawns with little or no summer irrigation; more frequent feeding is not automatically necessary.
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| Maintenance level | Application timing |
|---|---|
| Low | One application in October–November |
| Medium | Two applications: September–October and November–December |
| High | Three applications: September–October, October–November, and November–December |
| Very high | The three high-maintenance applications, plus a half-rate application in late May–early June |
These are AGR-1’s cool-season turf timings; its footnote identifies Kentucky bluegrass and tall fescue as the grasses covered. The rate per application depends on the recommendation for your maintenance level. Do not exceed the annual nitrogen recommendation.
Let the soil test determine phosphorus and potassium
Do not choose a fertilizer with phosphorus (P) or potassium (K) just because those nutrients are included in the bag. AGR-1 directs applications of phosphate and potash according to soil-test results and lists zero when test levels are adequate. As the publication states: “Applications of P2O5, K2O and Mg should be made based upon soil test results and follow the rate recommendations in Table 40.”
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For lawns and turf, AGR-1 specifies sampling soil at a 4-inch depth. Fertilizing without test results can mean applying more than needed, adding expense. Follow the University of Kentucky’s current AGR-1 guidance for soil testing and nutrient recommendations.
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How to calculate how much fertilizer to apply
Use the fertilizer label’s nitrogen percentage and lawn area to convert the nitrogen recommendation into product weight. AGR-212 describes this calculation approach; the label supplies the product’s application directions.
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- Measure the lawn area in square feet.
- Choose the nitrogen amount recommended for that application, expressed in pounds per 1,000 square feet.
- Convert the label’s nitrogen percentage to a fraction. For example, 20% nitrogen is 0.20.
- Divide the target pounds of nitrogen by that fraction to find the pounds of fertilizer needed per 1,000 square feet. Multiply by your lawn’s area divided by 1,000.
- Check the package directions and ensure your applications stay within the annual nitrogen recommendation.
For instance, if a recommendation calls for 1 pound of nitrogen per 1,000 square feet and the fertilizer is 20% nitrogen, the calculation is 1 ÷ 0.20 = 5 pounds of fertilizer per 1,000 square feet. This is an illustration of the math, not a recommendation to apply that rate to every lawn.
What to look for on the fertilizer label
- Nitrogen percentage: It determines how much product supplies the recommended nitrogen amount.
- Phosphorus and potassium: Their amounts should match your soil-test recommendation; adequate test levels call for zero according to AGR-1.
- Application rate and coverage: Follow the package directions and confirm the rate works for your measured lawn area.
- Intended use: Check whether the product is labeled for established turf or new seeding.
- Cost per treated area: Compare the cost for the area the package treats, not just the package price.
Kentucky Extension does not identify a best fertilizer brand or prescribe one universal NPK ratio for established lawns. The evidence also does not establish that 10-10-10, a weed-and-feed blend, or a starter formula is right for every lawn.
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What changes for a newly seeded lawn?
For seeded turf, Kentucky Extension says to wait until after the first mowing before applying nutrients. AGR-1 (2025–2026) permits 1.5 pounds of nitrogen per 1,000 square feet after that mowing, but says not to exceed the annual nitrogen recommendation. Base phosphorus and potassium on soil-test results; a product marketed as starter fertilizer does not by itself establish a need for extra phosphorus. See AGR-1 and AGR-212.
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Not on the basis of the lawn recommendations here. AGR-1’s schedules concern turf, not vegetables, flowers, fruit plantings, or other garden crops. Nutrient needs vary by crop and soil conditions, so use guidance specific to the crop and growing situation rather than carrying a tall-fescue lawn rate over to a garden bed.
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