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What Fertilizer Should You Use for Kentucky 31 Grass?

For Kentucky 31 tall fescue, use a fall nitrogen plan suited to lawn maintenance and let a soil test—not a fixed NPK blend—determine phosphorus and potassium.
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For an established Kentucky 31 tall fescue lawn in Kentucky, choose a fertilizer based on the lawn’s nitrogen target and a soil test—not a universal NPK ratio or brand. University of Kentucky guidance gives tall fescue an annual target of 2–4 pounds of nitrogen per 1,000 square feet, with applications in autumn; phosphorus and potassium should be added only at soil-test-recommended rates. Garden beds need crop-specific guidance, 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 University of Kentucky’s recommendations. The cited rates cover tall fescue and cool-season turf generally. Kentucky Extension describes turf-type tall fescues as preferred for lawns and Kentucky 31 as better suited to low-maintenance or utility turf. The fertilizer decision is therefore based on the lawn’s maintenance level and soil test, not a Kentucky 31-specific NPK ratio. University of Kentucky AGR-1, 2025–2026 and AGR-212.

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How much nitrogen does a Kentucky tall fescue lawn need?

University of Kentucky’s AGR-212 lists 2–4 pounds of nitrogen per 1,000 square feet per year for tall fescue, applied in autumn. The newer AGR-1 schedule expresses turf feeding by maintenance level, with 0–1.5 pounds of nitrogen per 1,000 square feet per application. Many home lawns with little or no summer irrigation fit low or medium maintenance; more frequent applications are not necessary for every lawn. AGR-212; AGR-1, 2025–2026.

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Fall schedule by maintenance level

Maintenance level Timing in University of Kentucky AGR-1
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

The schedule is for cool-season turf, including tall fescue. Choose the maintenance category that reflects how intensively the lawn is managed; do not treat the most frequent schedule as a default for a typical home lawn. The table and its application rates are in AGR-1, 2025–2026.

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How to choose the fertilizer’s NPK numbers

Use the fertilizer label to calculate how much product supplies the nitrogen rate you need. Then check whether its phosphorus and potassium content matches the soil-test recommendation. University of Kentucky directs that phosphate and potash be applied according to soil-test results, and its turf recommendations list zero when soil levels are adequate. A bag containing phosphorus or potassium is not automatically a better choice.

For example, if the target is 1 pound of nitrogen per 1,000 square feet and the label lists 20% nitrogen, divide 1 by 0.20: apply 5 pounds of that fertilizer per 1,000 square feet to provide the target nitrogen. This is a calculation example, not a recommendation to use that nitrogen rate; follow your lawn’s annual recommendation and package directions. AGR-212 describes calculating product amount from the nitrogen percentage. AGR-1, 2025–2026; AGR-212.

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  • Match nitrogen percentage to a practical application rate for your measured lawn area.
  • Use phosphorus and potassium only at the rates called for by your soil test.
  • Check the label’s coverage and application directions, and keep total nitrogen within the annual recommendation.
  • Distinguish products intended for established turf from those marketed for new seeding; a starter label does not establish a universal need for extra phosphorus.

Why get a soil test before buying fertilizer?

A soil test helps determine whether the lawn needs phosphorus or potassium and prevents unnecessary applications. University of Kentucky’s AGR-1 specifies sampling lawn and turf soil at a 4-inch depth. The publication cautions that recommendations made without test results can lead to more fertilizer than needed and higher expense. AGR-1, 2025–2026.

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What changes for newly seeded turf?

For seeded turf, University of Kentucky recommends waiting until after the first mowing before applying nutrients. AGR-1 permits 1.5 pounds of nitrogen per 1,000 square feet at that point, but says not to exceed the annual nitrogen recommendation. Base phosphorus and potassium on the soil test rather than assuming a starter fertilizer with extra phosphorus is required. AGR-1, 2025–2026.

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Can the same fertilizer be recommended for gardens?

No single fertilizer rate or product is supported for both Kentucky 31 lawns and gardens. The University of Kentucky recommendations cited here address turf. Vegetable beds, flower gardens, fruit plantings, and other crops can have different nutrient needs, so use guidance specific to the crop and soil conditions rather than transferring a lawn rate to a garden.

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