Best Ammonium Sulfate Fertilizer (21-0-0 + 24% S): Nitrogen & Sulfur That Lowers Soil pH Buy on Old Cobblers Farm
Old Cobblers Farm™ Wicked Growth Ammonium Sulfate 21-0-0 Fertilizer
by Wicked Growth — Littleton, NH
21% Nitrogen + 24% Sulfur
Two critical nutrients in every granule. 21% nitrogen feeds the plant while 24% sulfur acidifies the soil, improves protein synthesis, and enhances flavor compounds in crops.
Lowers Soil pH
Ammonium sulfate is inherently acidifying. Each application nudges pH downward — exactly what blueberries, azaleas, rhododendrons, and evergreens need to thrive.
Acid-Lover's Preferred N Source
Extension services recommend ammonium sulfate as the nitrogen source for acid-loving crops. It feeds the plant AND maintains the low pH they require.
Sulfur Deficiency Correction
24% sulfur addresses sulfur deficiency — increasingly common in modern soils. Sulfur is essential for protein formation, chlorophyll, and crop flavor development.
1,000–2,500 sq ft Per Bag
At lawn rates, one 5 lb bag covers 1,000–2,500 sq ft. Efficient application for targeted acidification and nitrogen feeding.
Cool-Season Lawn Favorite
Preferred by turf professionals for cool-season lawns. Provides quick green-up with sulfur that improves soil structure and nutrient availability in alkaline soils.
Low Burn Risk vs. Urea
At 21% N, ammonium sulfate has a lower burn risk per application than 46-0-0 urea. Safer for direct application near plant roots and on established lawns.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 21-0-0 |
| Derived From | Ammonium Sulfate (100%) |
| Item Form | Granular (crystalline) |
| Release Speed | Quick-release |
| Application Rate | 2–5 lbs / 1,000 sq ft (lawn) | 1–2 lbs / 100 sq ft (garden) |
| Method | Broadcast or side-dress |
| Frequency | 2–4x per season |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| Supports | Lawns, blueberries, azaleas, rhododendrons, evergreens, acid-loving plants |
| Setups | Lawns, garden beds, raised beds, containers, orchards |
| Feature | Old Cobblers Farm™ Wicked Growth Ammonium Sulfate 21-0-0 Fertilizer | Ammonium Sulfate Fertilizer | Ammonium Sulfate | Ammonium Sulfate Fertilizer | 21-0-0 Ammonium Sulfate | 21-0-0 AM Turfgrass Fertilizer | Dark Matter Ammonium Sulfate | Ammonium Sulfate | Water Soluble Ammonium Sulfate | Ammonium Sulfate Plant Food | SoluGreen Ammonium Sulfate |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 | 21-0-0 |
| Phosphorus | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| Potassium | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
| Form | Granular (crystalline) | ||||||||||
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb | 2-10 lb | 4 lb, 16 lb | 5 lb | 50 lb | 50 lb | 40 lb | 5 lb, 10 lb | 5-50 lb | 5 lb | 50 lb |
| Release Speed | Quick-release |
Ammonium Sulfate Fertilizer
Ammonium Sulfate
Ammonium Sulfate Fertilizer
21-0-0 Ammonium Sulfate
21-0-0 AM Turfgrass Fertilizer
Dark Matter Ammonium Sulfate
Ammonium Sulfate
Water Soluble Ammonium Sulfate
Ammonium Sulfate Plant Food
SoluGreen Ammonium Sulfate
21% Nitrogen + 24% Sulfur
Two critical nutrients in every granule. 21% nitrogen feeds the plant while 24% sulfur acidifies the soil, improves protein synthesis, and enhances flavor compounds in crops.
Lowers Soil pH
Ammonium sulfate is inherently acidifying. Each application nudges pH downward — exactly what blueberries, azaleas, rhododendrons, and evergreens need to thrive.
Acid-Lover's Preferred N Source
Extension services recommend ammonium sulfate as the nitrogen source for acid-loving crops. It feeds the plant AND maintains the low pH they require.
Sulfur Deficiency Correction
24% sulfur addresses sulfur deficiency — increasingly common in modern soils. Sulfur is essential for protein formation, chlorophyll, and crop flavor development.
