Nitrogen Application Calculator
By Fertilizer Product
Calculate application rate from any nitrogen fertilizer
Organic Nitrogen Sources
Compare organic nitrogen sources for your garden
Formula
Product (lbs) = Target N (lbs) / (N% / 100) | Target N = (Area / 1000) × N Rate per 1000 sq ft
Frequently Asked Questions
How do I calculate nitrogen from fertilizer percentage?
Divide the target nitrogen (lbs) by the fertilizer's N percentage (as a decimal). For example, to apply 1 lb of N using 46-0-0 urea: 1 / 0.46 = 2.17 lbs of urea. For a 20-5-10 fertilizer: 1 / 0.20 = 5 lbs of product.
How much nitrogen does my lawn need per year?
Most lawns need 2-4 lbs of nitrogen per 1000 sq ft per year, applied in 3-4 split applications of 0.5-1 lb each. Cool-season grasses need 3-4 lbs/year, warm-season grasses need 2-4 lbs/year. Low-maintenance lawns can get by with 1-2 lbs/year.
What are signs of nitrogen deficiency?
Nitrogen deficiency causes: pale yellow-green leaves (especially older leaves), stunted growth, thin/sparse turf, reduced yields, and poor overall plant vigor. Excess nitrogen causes: dark green lush growth, leggy plants, reduced fruiting, and environmental pollution.
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