Ammonium Sulfate 21-0-0 Fertilizer

Fast-Acting Nitrogen with Added Sulfur — Ideal for High pH Soils.

21-0-0 Ammonium Sulfate delivers 21% fast-release nitrogen along with 24% sulfur, making it an excellent choice for lawns that need quick green-up while improving nutrient availability in alkaline soils.

This is a preferred nitrogen source for experienced lawn enthusiasts and professionals who want reliable performance without the volatility concerns of urea.

Why Choose Ammonium Sulfate Over Urea?

• Lower volatilization risk compared to urea
• Helps lower soil pH over time in alkaline soils
• Improves iron availability for deeper green color
• Excellent for spoon-feeding programs
• Fully soluble for liquid applications

If you have high pH soil or struggle with yellowing turf despite fertilizing, ammonium sulfate is often the better nitrogen source.

Best Used For

• Correcting nitrogen deficiency
• Summer feeding programs
• High pH or alkaline soils
• Liquid lawn applications
• Boosting color before events or peak growth periods

Application Rates

Maximum recommended nitrogen rate: 1 lb N per 1,000 sq ft per application.

• 1 lb N = 4.75 lbs of 21-0-0 per 1,000 sq ft
• 0.5 lb N = 2.4 lbs per 1,000 sq ft

Water in after application for best results.

Liquid or Granular

• Dissolves easily for spray applications
• Can be applied granular with a broadcast spreader

Looking for controlled-release nitrogen? Consider our professional blended fertilizers for longer feeding and reduced burn risk.