Understanding Bermuda’s Nitrogen Requirements

Fertilizing your Bermuda grass lawn is a balancing act that requires a nuanced understanding of nutrient requirements, particularly nitrogen. While Bermuda grass is known for its love of nitrogen, too much of a good thing can lead to problems like rapid growth and thatch buildup. In this comprehensive guide, we’ll explore how to determine the right amount of nitrogen for your lawn, how to read fertilizer labels, and what types of nitrogen are available.

Nitrogen Requirements: How Much is Enough?

For Thin Lawns

If your Bermuda grass lawn is thin and needs filling in, aim for 1.0-1.5 lbs of Nitrogen per thousand square feet of lawn per month. This will encourage faster growth and help your lawn become denser.

For Mature Lawns

For lawns that are already mature and reasonably thick, a lower amount of 0.5-1.0 lbs of Nitrogen per thousand square feet per month should suffice. This will maintain your lawn without causing excessive growth.

Understanding NPK Ratios

While nitrogen is crucial, it’s not the only nutrient your lawn needs. Phosphorus (P) and Potassium (K) are also essential but are best determined through a soil sample test from your local extension office. As a rule of thumb, a 2:1 Nitrogen to Potassium ratio is generally safe, as Potassium tends to leach from the soil regularly.

Reading Fertilizer Labels: A Case Study

Let’s consider a Scotts Turf Builder with a 32-0-4 analysis. Here’s how to interpret it:

  • 32% Nitrogen: To get 1 lb of Nitrogen on your lawn, you would need to apply about 3 lbs of this product per thousand square feet.
  • 9% Slow Release Nitrogen: This indicates that 9% of the 32% total Nitrogen is slow-release. To find out the percentage of slow-release in the bag, divide 9 by 32, which gives you 0.28125 or 28%. This means the bag contains 28% slow-release fertilizer and 72% fast-release.

Types of Nitrogen: Slow vs. Fast Release

Slow Release Nitrogen

Usually coated Urea, slow-release nitrogen provides a steady supply of nutrients over 4-8 weeks. This is ideal for sustained, even growth.

Fast Release Nitrogen

Commonly found as Urea (46-0-0) or Ammonium Sulfate (21-0-0), fast-release nitrogen is quickly used up by the grass or lost through volatilization or leaching within 2-3 weeks. It’s generally cheaper but needs to be applied more frequently.


Fertilizing your Bermuda grass lawn is not a one-size-fits-all endeavor. The amount of nitrogen you need depends on the current state of your lawn and your goals for its appearance and health. By understanding how to read fertilizer labels and the differences between slow and fast-release nitrogen, you can make informed decisions that will help your Bermuda grass thrive. So grab that fertilizer bag, do some quick math, and get ready to give your lawn the nutrients it craves.






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