Side-by-Side Comparison
Lawn & Garden
Fertilizer N-P-K vs. Grass Mowing Heights
Comparing 2 standards across 16 specifications. 16 key differences identified.
Comparing:
Fertilizer N-P-K
Grass Mowing Heights
Fertilizer labels display three numbers representing percentage by weight of Nitrogen (N) for foliage growth, available Phosphate (P2O5) for root development, and soluble Potash (K2O) for drought and cold hardiness.
Turfgrass cutting heights vary between cool-season grasses (Kentucky Bluegrass 2.5–3.5", Tall Fescue 3–4") and warm-season grasses (Bermudagrass 1–2", Zoysia 1–2"), governed by the One-Third Rule never removing more than 1/3 of the blade in a single mowing.
Specification Comparison Table
16 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
AAPFCO Guaranteed Analysis / USDA Fertilizer Sizing Guidelines | GCSAA Guidelines / University Turf Extension Research |
|
First Number (N)
|
Nitrogen % | Promotes rapid leaf blade growth and green chlorophyll synthesis | — |
|
Second Number (P)
|
Phosphate (P2O5) % | Stimulates root establishment and blossom/fruit set | — |
|
Third Number (K)
|
Potash (K2O) % | Strengthens cell walls for drought, heat, and disease resistance | — |
|
Balanced All-Purpose (10-10-10)
|
10% N, 10% P2O5, 10% K2O (General vegetable garden & flower bed standard) | — |
|
Lawn Maintenance (24-0-11)
|
High nitrogen turf blend for established lawns without phosphorus runoff | — |
|
Starter Fertilizer (18-24-12)
|
High phosphorus blend for new sod establishment and seed germination | — |
|
1.0 lb Nitrogen per 1k sq ft Rule
|
Lbs of product = 100 ÷ Nitrogen % (e.g. 20-5-10 requires 5.0 lbs/1,000 sq ft) | — |
|
The One-Third Rule
|
— | Never remove more than 1/3 of total grass blade height in one mowing |
|
Kentucky Bluegrass
|
— | 2.5 to 3.5 inches (6.4–8.9 cm) | Cool-season standard |
|
Tall Fescue
|
— | 3.0 to 4.0 inches (7.6–10.2 cm) | Drought-tolerant cool-season |
|
Perennial Ryegrass
|
— | 2.0 to 3.0 inches (5.1–7.6 cm) | Cool-season overseed |
|
Fine Fescue
|
— | 2.0 to 3.0 inches (5.1–7.6 cm) | Shade-tolerant cool-season |
|
Bermudagrass
|
— | 1.0 to 2.0 inches (2.5–5.1 cm) | Warm-season sun lover (Reel or rotary) |
|
Zoysiagrass
|
— | 1.0 to 2.0 inches (2.5–5.1 cm) | Dense warm-season carpet |
|
St. Augustinegrass
|
— | 3.0 to 4.0 inches (7.6–10.2 cm) | Coarse warm-season lawn |