Using Urea as a Sole Nitrogen Source for Lawns: Calculating Rates and Spreader Settings

When Urea Alone Works

If soil test shows only nitrogen is needed, urea (46-0-0) is fine. But a balanced fertilizer is usually better unless test specifies otherwise.

Calibrating a Scotts Spreader for Urea

1. Find spreader setting for a known fertilizer (e.g., 16-4-4 at 12 lbs/1,000 sq. ft. = 2 lbs N/1,000 sq. ft.).
2. Urea is 46% N. To supply 2 lbs N, apply 2 ÷ 0.46 = 4.35 lbs urea/1,000 sq. ft.
3. Use the same spreader setting that delivers 12 lbs/1,000 sq. ft. of the reference product, but only put 4.35 lbs urea in the hopper per 1,000 sq. ft. of lawn.

Safe Approach

• If unsure, apply half the calculated rate in two perpendicular passes.
• Observe response; adjust next application.
• Contact Scotts for official settings: lawncare.scotts.com.

Urea is fast-release; water in well to prevent burn. Consider sulfur-coated urea for slower release.