Best Ammonium Sulfate Fertilizer (21-0-0 + 24% S): Nitrogen & Sulfur That Lowers Soil pH Buy on Old Cobblers Farm
Two nutrients in one product. 21% nitrogen for growth plus 24% sulfur that actively lowers soil pH — the preferred nitrogen source for acid-loving plants and alkaline soils that need correction.
Old Cobblers Farm™ Wicked Growth Ammonium Sulfate 21-0-0 Fertilizer
by Conventional Fertilizer — 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 |
| Item Form | Granular (crystalline) |
| Coverage | 1,000–2,500 sq ft (lawn) per 5 lb bag |
| Category | Conventional Fertilizer |
| Type | All-Purpose NPK Blends |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| NPK | 21-0-0 |
| Nitrogen | 21% |
| Phosphorus | 0% |
| Potassium | 0% |
| Sulfur | 24% |
| Form | Granular (crystalline) |
| Rate | 2–5 lbs / 1,000 sq ft (lawn) |
| Method | Broadcast or side-dress |
| Sizes | 5, 10, 15, 20 lb bags |
| Best For | Acid-loving plants, alkaline soil correction, lawns, blueberries |
| Feature | Old Cobblers Farm™ Wicked Growth Ammonium Sulfate 21-0-0 Fertilizer Old Cobblers Farm | Ammonium Sulfate Fertilizer Greenway Biotech | Ammonium Sulfate Hi-Yield (VPG) | Ammonium Sulfate Fertilizer Easy Peasy Plants | 21-0-0 Ammonium Sulfate Simplot Best | 21-0-0 AM Turfgrass Fertilizer LESCO | Dark Matter Ammonium Sulfate Lawn Life | Ammonium Sulfate Alpha Chemicals | Water Soluble Ammonium Sulfate Seed Ranch | Ammonium Sulfate Plant Food Supply Solutions | SoluGreen Ammonium Sulfate Custom Hydro |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Form | Granular (crystalline) | — | — | — | — | — | — | — | — | — | — |
| Coverage | 1,000–2,500 sq ft (lawn) per 5 lb bag | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed | Not listed |
| Price / Size | 5 lb | 10 lb | 15 lb | 20 lb | $15-$35 | $10-$30 | $15-$20 | $40-$60 | $45-$55 | $55-$60 | $19-$30 | $30-$80 | $25 | $35-$60 |
| Our Take | The only nitrogen fertilizer in the lineup that doubles as a soil a... | — | — | — | — | — | — | — | — | — | — |
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.
