Ammonium Sulfate Fertilizer 21-0-0
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Ammonium Sulfate Fertilizer 21-0-0
Premium nitrogen and sulfur fertilizer for professional results. Fast-acting, 100% water-soluble formula provides rapid nutrient delivery and supports soil acidification for alkaline conditions—perfect for lawns and acid-loving plants like blueberries.
✓Made in USA
🏆Since 1989
📦Free Shipping $35+
♻️Eco-Friendly
See the Difference in Days
Day 1💧Apply & Water
Day 3-5🌱First Signs
Day 7-10🌿Visible Greening
Day 14+🌾Full Results
Perfect For These Applications
Lawns
4 lb/1000 sq ft
Vegetables
2-3 tbsp/plant
Blueberries
1/4 cup/bush
Houseplants
1 tbsp/gallon
Common Lawn & Garden Problems? We've Got Solutions
😟 Yellow, patchy lawn?
✅ 21% nitrogen delivers rapid greening in 7-10 days
😟 Blueberries not thriving?
✅ Natural acidification creates perfect pH conditions
😟 Slow plant growth?
✅ 24% sulfur boosts chlorophyll production
😟 Alkaline soil issues?
✅ Gradual pH reduction improves nutrient availability
💪 21% Nitrogen
Fast-acting water-soluble nitrogen for rapid green growth and vigorous development
🔬 24% Sulfur
Essential sulfur supports chlorophyll formation and helps acidify alkaline soils over time
⚡ 100% Soluble
Dissolves quickly for immediate availability through soil or foliar application
SOIL pH GUIDE
Understanding pH & Ammonium Sulfate's Role
Ammonium sulfate helps acidify alkaline soils over time. The exact pH change depends on soil type, buffering capacity, and application rate.
4.05.57.08.510.0
Blueberries: 4.5-5.5 | Most Plants: 6.0-7.0 | AMS helps lower pH
| Plant Type | Optimal pH | AMS Benefit |
|---|---|---|
| Blueberries | 4.5-5.5 | Excellent - Creates ideal conditions |
| Azaleas | 5.0-6.0 | Excellent - Maintains acidity |
| Lawn Grass | 6.0-7.0 | Good - Provides N + slight acidification |
| Vegetables | 6.0-6.8 | Good - Supplies needed nitrogen |
⚠️ Important Safety Information
- Keep off concrete/pavement (may stain)
- Store in cool, dry place away from moisture
- Keep away from children and pets during application
- Water thoroughly after application to prevent burn
- Avoid mixing with urea in storage (creates cement when wet)
FEATURES & QUALITY GUARANTEE
- High Nitrogen: 21% ammonical nitrogen (NH₄⁺) for rapid uptake
- Sulfur Rich: 24% sulfur (S) for protein synthesis
- 100% Water Soluble: Quick dissolution and easy application
- Versatile Use: Lawns, vegetables, fruits, flowers, houseplants
- pH Support: Helps acidify alkaline soils; verify with soil test
- Professional Grade: Used by commercial growers worldwide
- CDFA Registered: Registered with California Department of Food & Agriculture
- Eco-Friendly Packaging: Biodegradable packaging materials
- Made in USA: Manufactured in California since 1989
- Quality Tested: Third-party laboratory tested for purity
- Heavy Metal Free: Rigorously tested to ensure safety
- 90-Day Guarantee: Full refund if not completely satisfied
Quick Dosage Guide
Select an application type above
APPLICATION RATES & TIMING
Mix into topsoil or dissolve in water. Always water thoroughly after application.
📅 Seasonal Application Guide
Spring
Begin when grass greens (Mar-Apr)
Summer
Apply early AM/PM, water well
Fall
Last app 6 weeks before frost
Winter
No apps for dormant lawns
🌾 Lawn Application
| Area | Rate per App | Frequency |
|---|---|---|
| Per 1,000 sq ft | 3-5 lb | Every 4-6 weeks |
| Per Acre | 120-200 lb | As needed |
🥬 Vegetables
| Type | Per 1,000 sq ft | Per Plant |
|---|---|---|
| Leafy Greens | 1-2 lb | 1-2 tbsp |
| Fruiting | 2-3 lb | 2-3 tbsp |
| Root Crops | 1.5-2.5 lb | 1.5-2.5 tbsp |
🪴 Houseplants
| Plant Size | Rate | Frequency |
|---|---|---|
| Small | 1 tsp/gal | Every 4-6 weeks |
| Medium-Large | 1-2 tbsp/gal | Every 4-6 weeks |
FERTILIZER CALCULATOR
Ammonium Sulfate Calculator
Calculate exact amounts with annual nitrogen tracking
Lawn Application
📋 Recommended: 3-5 lb per 1,000 sq ft every 4-6 weeks
Vegetable Garden
📋 Rates vary by plant type (1-3 lb per 1,000 sq ft)
Houseplants
📋 Mix 1-2 tbsp per gallon of water
Acid-Loving Plants
📋 Special rates for pH management
Cost Comparison
📋 Compare costs with other nitrogen sources
COMPARE WITH OTHER FERTILIZERS
| Feature | Ammonium Sulfate | Urea | Calcium Nitrate |
|---|---|---|---|
| Nitrogen % | 21% | 46% | 15.5% |
| Sulfur % | 24% | 0% | 0% |
| pH Effect | Acidifying | Acidifying | Alkalizing |
| Best For | Acid-loving plants, alkaline soils | Quick green-up | Calcium deficient soils |
| Cost per lb N | Moderate | Low | High |
QUICK REFERENCE GUIDE
📋 Application Quick Reference
Lawns:
4 lb/1000 sq ft = 0.84 lb N
Every 4-6 weeks
4 lb/1000 sq ft = 0.84 lb N
Every 4-6 weeks
Blueberries:
1/4-1/2 cup per plant
2x per year (spring + fall)
1/4-1/2 cup per plant
2x per year (spring + fall)
Vegetables:
2-3 tbsp per plant
At planting & flowering
2-3 tbsp per plant
At planting & flowering
Houseplants:
1-2 tbsp per gallon
Monthly in growing season
1-2 tbsp per gallon
Monthly in growing season
DOCUMENTS
FREQUENTLY ASKED QUESTIONS
What is ammonium sulfate?
Ammonium sulfate provides nitrogen (21%) as NH₄⁺ and sulfur (24%) as SO₄²⁻. It dissolves quickly for rapid nutrient delivery. Water thoroughly after application.
Does it lower soil pH?
Yes, it helps acidify alkaline soils over time. The exact pH change depends on soil type, buffering capacity, and application rate. Always confirm with soil testing.
Can I use it on blueberries?
Yes! Perfect for acid-loving plants. Apply 1/4-1/2 cup per bush twice yearly. Target soil pH 4.5-5.5. Monitor with regular soil tests.
How quickly does it work?
Very fast - dissolves within 24-48 hours when watered in. Visible greening in 7-10 days. Effects last 4-6 weeks.
Can I mix with other fertilizers?
Yes, but avoid lime or alkaline materials. Combines well with phosphorus and potassium. Never mix with urea in storage (creates cement when wet).