Ammonium sulfate, also called sulphate of ammonia, is a nitrogen fertilizer; products labeled 21-0-0 list nitrogen as the only primary nutrient in the N-P-K analysis. The options below range from small packs for limited garden use to larger bags for broader applications. Choose the 1-pound or 2-pound option for a small amount, the 5-pound or 10-pound bag for more coverage, or the 40-pound bag for larger needs. Always follow the package directions and consider a soil test before applying nitrogen.
| Product | Best suited for | Listed size or detail |
|---|---|---|
| Ammonium Sulfate 21-0-0 Fertilizer | Small projects | 1 lb; water soluble |
| Ammonium Sulfate High Nitrogen Fertilizer | Moderate-use gardens | 5 lb |
| Ammonium Sulfate 21-0-0 Fertilizer | Small-to-medium projects | 2 lb; water soluble |
| CountryMax Ammonium Sulfate | Lawn and garden applications | 10 lb; 21-0-0 |
| 21-0-0 Ammonium Sulfate Fertilizer | Larger applications | 40 lb |
Ammonium Sulfate 21-0-0, 1 Pound
This 1-pound product is a compact choice for gardeners who want ammonium sulfate for a limited application rather than a large supply. Its product name specifies a 21-0-0 analysis and describes the fertilizer as water soluble, with intended use for lawns, crops, and gardens.
Best for: Small gardens or buyers who want a modest quantity. It was selected because the listed analysis and water-soluble description make its basic fertilizer type clear. Limitation: The small package may not be practical for treating a large lawn or multiple extensive beds. Check the label for application rates and directions before use.
Ammonium Sulfate High Nitrogen, 5 Pounds
The product is described as a high-nitrogen ammonium sulfate fertilizer for plants, with a 5-pound package size. Its name emphasizes rapid plant growth, but buyers should use the label’s directions rather than treating that wording as a guaranteed result.
Best for: Gardeners who need more than a small trial quantity but do not want the largest bag listed here. It offers a middle-size option for plant-focused use. Limitation: The supplied product details do not state an N-P-K analysis, so verify the package label if you specifically need 21-0-0 or require a particular nutrient analysis.
Ammonium Sulfate 21-0-0, 2 Pounds
This 2-pound version is identified as water-soluble ammonium sulfate with a 21-0-0 analysis. The listed uses include lawns, crops, and gardens. Compared with the 1-pound option, it provides a larger package while keeping the same stated fertilizer analysis and product description.
Best for: Buyers with a small-to-medium application who want a stated 21-0-0 analysis. Choose this if the 1-pound size seems too limited but a large bag would be unnecessary. Limitation: The listing does not provide application rates in the supplied details. Follow the package instructions, and avoid applying based on package size alone.
CountryMax Ammonium Sulfate, 10 Pounds
CountryMax is listed as a 10-pound ammonium sulfate fertilizer for lawn and garden use. The product name specifies 21-0-0, making this a larger-format option for buyers who want a stated nitrogen analysis for their planned application.
Best for: Lawn and garden users who need more product than the small packs provide. It was selected for its clearly stated 10-pound size and lawn-and-garden positioning. Limitation: A 10-pound bag may be more than needed for a small planting area. Store any remaining fertilizer according to its label and keep it away from children and pets.
21-0-0 Ammonium Sulfate, 40 Pounds
This product is labeled 21-0-0 ammonium sulfate and comes in a 40-pound package. Its large size makes it the most suitable choice in this group for buyers planning larger applications or needing a substantial supply.
Best for: Larger properties or buyers who have a specific, label-directed need for a high-volume supply. The stated analysis and bag size make it easy to compare with smaller options. Limitation: The 40-pound package can be excessive for a small garden, and the supplied details do not specify water solubility or particular application instructions. Confirm those details on the product label.
Buying Guide: How To Choose Ammonium Sulfate Fertilizer
What does 21-0-0 mean?
An N-P-K ratio shows the percentage by weight of nitrogen, phosphate, and potash, in that order. A 21-0-0 label indicates 21% nitrogen and zero listed phosphate and potash. It does not mean the product supplies every nutrient plants may need. Use a soil test and the fertilizer label to guide your choice.
Which package size should you choose?
Match package size to the area you intend to treat and the label’s application rate. The 1-pound and 2-pound packs suit smaller needs; the 5-pound and 10-pound options provide more product; and the 40-pound bag is intended for buyers who can use and store a larger quantity. Do not apply extra fertilizer simply because a bag is large.
Does water solubility matter?
Two listings specifically describe their product as water soluble. That detail may matter if you plan to mix fertilizer with water, but follow the product directions to determine the correct method and amount. Do not assume the other products are water soluble unless their packaging confirms it.
What should you check before applying it?
Read the label for the rate, timing, application method, and any precautions for the intended plants or area. Ammonium sulfate supplies nitrogen, so it is not a substitute for a balanced fertilizer when other nutrients are needed. Avoid guessing at rates, and keep fertilizer stored securely.
Frequently Asked Questions
Is ammonium sulfate the same as sulphate of ammonia?
Yes. “Sulphate of ammonia” is another name for ammonium sulfate, the nitrogen fertilizer covered in this guide.
Can ammonium sulfate be used on a lawn?
Some listed products are described for lawn use. Check the specific package label for suitable uses and application directions before applying it to turf.
Can I use it for garden plants?
Some listings identify lawns, crops, gardens, or plants as intended uses. Confirm that the product label covers your plant type and follow its directions.
How much ammonium sulfate should I apply?
The correct amount depends on the product label, the area, and the plants’ needs. Use the stated application rate and consider a soil test rather than estimating.
Which size is best for a small garden?
The 1-pound or 2-pound package is likely easier to manage for a limited application. Choose based on the area to treat and the directions on the label.