Fertilizer Math Made Easy: Converting 16-4-8 to Available Products

Matching Soil Test Recommendations to Store-Bought Fertilizers

Your UGA soil test recommends 16-4-8 fertilizer, but local stores don't carry it. Don't worry—you can blend common fertilizers to achieve the same nutrient ratio using the UGA Fertilizer Calculator.

Understanding Fertilizer Grades

The three numbers represent percentage by weight of nitrogen (N), phosphorus (P₂O₅), and potassium (K₂O). A 16-4-8 fertilizer contains 16% N, 4% P, and 8% K.

Blending Options from Home Depot Products

Using products typically available at Home Depot, here are two exact blends per 1,000 sq ft:

Option 1

• 10.9 lbs of 24-0-11
• 3.3 lbs of 18-24-12

Option 2

• 8.0 lbs of 10-10-10
• 10.0 lbs of 24-0-11

Using the UGA Fertilizer Calculator

The UGA Fertilizer Calculator eliminates guesswork:

1. Enter your soil test recommendation (16-4-8 at specified rate)
2. Input the fertilizer grades available at your local store
3. The calculator provides exact blending ratios

Practical Tips

• Mix fertilizers thoroughly before application
• Apply when grass is dry, water in afterward
• Calibrate your spreader for the blended product
• Store leftover blend in sealed containers, labeled with analysis

With the calculator, you're never stuck when the exact fertilizer grade isn't available—you can always create a custom blend that meets your soil's needs precisely.