Best Lawn Fertilizer N-P-K Numbers

Do a Google search and you can spend ALL day reading about the best N-P-K fertilizer numbers for lawns.  After TWO YEARS of actual testing and research we have concluded the following.

Number One:  99% of home owners in the United States never get a soil test done. (Fact)

Number Two:  The majority of University, scientific studies, and turf professionals say… “Lacking a soil test, an 8-1-2 to a 4-1-2 N-P-K fertilizer number mix is the best choice for overall lawn quality.” (Fact)

Below you will find just a FEW of the quotes from the 100s of studies online about best n-p-k  fertilizer numbers for lawns.

University of Illinois Ext – N-P-K Comments

Recommended ratios of N-P-K for lawn fertilizers include 3:1:2 or 4:1:2.

Oklahoma State Ext – N-P-K Comments

Balanced fertilizers, having a ratio of 4-1-2 or 3-1-2, supply nutrients closest to actual plant needs; a 20-5-10 (4-1-2) source is usually a superior fertilizer compared to a 10-20-10 (1-2-1) source for lawn maintenance purposes.

UGA  Ext (Centipede) – N-P-K Comments

If soil testing is not used, a general purpose fertilizer with a 3-1-2 nitrogen-phosphorus-potassium ratio such as 12-4-8 is good.

University of Nebraska– N-P-K Comments

ideal fertilizer ratios for different cool-season species  4-1-3 to 8-1-4

NC State Ext – N-P-K Comments

However, In the absence of a soil test, use a complete nitrogen-phosphorus-potassium (N-P-K) turf-grade fertilizer with a 3-1-2 or 4-1-2 ratio. For example 12-4-8 is a commercial fertilizer that has the ratio 3-1-2.

Texas A&M Ag Ext – N-P-K Comments

In the absence of soil test information, apply a fertilizer with a 3-1-2 or 2-1-1 ratio

Mississippi State Unv Ext – N-P-K Comments

Complete fertilizers containing nitrogen (N), phosphorus (P), and potassium (K) (potash) can be used on landscapes and turf. It is generally best to look for an N-P-K ratio of 3-1-2

Unv of Florida Ext Office – N-P-K Comments

Turf grasses require the macro nutrients nitrogen (N), phosphorus (P), and potassium (K) in greatest quantities. Calcium (Ca), magnesium (Mg), and sulfur (S) are required in smaller quantities. The micro nutrients iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), chlorine (Cl), molybdenum (Mo), and boron (B) are required in very minute quantities. Micro nutrients are as essential as the macro nutrients, but are required in much smaller amount.

University of Kentucky AG School  ↓


University of Idaho – N-P-K Comments

Lawns do best when fertilized with a fertilizer having a 3:1:2:1 ratio of N, P, K,

Washington State Ext – N-P-K Comments

In  western  Washington, deficiencies of phosphorus and potassium are common; therefore, fertilizers with a 3-1-2 or 6-1-4 ratio of N-P-K usually give best results.

Unv of Missouri Ext – N-P-K Comments

For routine maintenance where a soil test or experience indicates no major deficiencies, use a lawn fertilizer with an approximate ratio of 3:1:1 or 4:1:1 or 4:1:2 at recommended rates according to the schedule

Unv Mass– N-P-K Comments

If a soil test is not immediately available, a fertilizer ratio of about 3-1-2 to 5-1-2 is normally recommended for turf.

NC Ext ↓

The best n-p-k numbers for the majority of lawns is a 4-1-2 to an 10-1-2 ratio.  Your lawn may also require some MICRO nutrients so they are also included in the Super Juice formula. There are MANY OPINIONS out there, but in the end the overall consensus is that a balance fertilizer n-p-k ratio, along with needed micro nutrients is the best general fertilizer for most lawns.

Also added for lawn health are Humic Acids and sea kelp.