28-0-0 Fertilizer Calculator
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Reviewed by Calculator Editorial Team
28-0-0 fertilizer is a concentrated nitrogen-based fertilizer used primarily for lawn care and turf grass maintenance. This calculator helps you determine the exact amount of 28-0-0 fertilizer needed for your specific application, based on the area to be treated and the desired nitrogen content.
What is 28-0-0 Fertilizer?
28-0-0 fertilizer is a granular product that provides pure nitrogen (N) without any phosphorus (P) or potassium (K). The numbers in the name represent the percentage of these nutrients by weight:
- First number (28): Nitrogen content (28% nitrogen)
- Second number (0): Phosphorus content (0% phosphorus)
- Third number (0): Potassium content (0% potassium)
This fertilizer is particularly useful for:
- Lawn care and turf grass maintenance
- Cool-season grass establishment
- Weed control through nitrogen competition
- Fertilizing new lawns or areas with poor soil nitrogen levels
Important: 28-0-0 fertilizer is not recommended for vegetable gardens, fruit trees, or other plants that require phosphorus and potassium. These plants need a balanced fertilizer with all three nutrients.
How to Use This Calculator
To use the 28-0-0 fertilizer calculator:
- Enter the area you need to fertilize in square feet or square meters
- Select the desired nitrogen application rate (pounds per 1,000 square feet or kilograms per hectare)
- Click "Calculate" to see the recommended amount of 28-0-0 fertilizer needed
- Review the result and adjust your application as needed
The calculator will provide you with the exact amount of 28-0-0 fertilizer required for your specific application, based on the inputs you provide.
Formula Explained
The calculation for 28-0-0 fertilizer is based on the following formula:
Fertilizer Needed (lbs) = (Area × Application Rate) / 1,000
Where:
- Area = The size of the area to be fertilized (square feet or square meters)
- Application Rate = The recommended nitrogen application rate (pounds per 1,000 square feet or kilograms per hectare)
For example, if you have 5,000 square feet of lawn and want to apply 1.5 pounds of nitrogen per 1,000 square feet:
Fertilizer Needed = (5,000 × 1.5) / 1,000 = 7.5 pounds of 28-0-0 fertilizer
Recommended Application Rates
Typical application rates for 28-0-0 fertilizer vary depending on the specific needs of your lawn or turf:
| Application Scenario | Recommended Rate (lbs per 1,000 sq ft) | Recommended Rate (kg per hectare) |
|---|---|---|
| New lawn establishment | 1.5-2.0 | 1.7-2.2 |
| Cool-season grass maintenance | 1.0-1.5 | 1.1-1.7 |
| Weed control | 0.5-1.0 | 0.6-1.1 |
| High-traffic areas | 1.5-2.5 | 1.7-2.8 |
Always follow the manufacturer's recommendations and adjust application rates based on your specific soil conditions and lawn needs.
Frequently Asked Questions
Q: Can I use 28-0-0 fertilizer on vegetable gardens?
A: No, 28-0-0 fertilizer is not suitable for vegetable gardens. It provides only nitrogen and lacks the phosphorus and potassium needed for vegetable growth. Use a balanced fertilizer like 10-10-10 or 5-10-5 for vegetable gardens.
Q: How often should I apply 28-0-0 fertilizer?
A: The frequency of application depends on your specific needs. For new lawns, you might apply 28-0-0 fertilizer every 4-6 weeks during the growing season. For established lawns, you may only need applications every 8-12 weeks.
Q: Is 28-0-0 fertilizer safe for pets and children?
A: Yes, 28-0-0 fertilizer is generally safe for pets and children when used as directed. However, keep it out of reach of small children and pets to prevent accidental ingestion.