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Ammonium Sulfate 21-0-0 FAQ

1. Is Ammonium Sulfate fertilizer good for tomato plants?

We recommend using Greenway Biotech, Inc. Tomato Fertilizer for tomato plants since that was specifically formulated for maximum yield for tomato plants. However, if you are using dry granular fertilizer then you should apply Ammonium Sulfate at the rate of 1 tablespoon per plant. Make sure not to over apply because Nitrogen fertilizers could kill plants easily.


2. Is Ammonium Sulfate fertilizer good for blueberries?

Yes, the best kind of Nitrogen fertilizer for blueberries is Ammonium and Ammonium Sulfate is one of the best and most affordable source of Ammonium Nitrogen. Also, you should avoid using Nitrate Nitrogen on blueberries because they are very sensitive to nitrate ions and they could damage blueberries very easily. In addition, because blueberries are very sensitive you need to make sure not to over apply readily available nitrogen fertilizer because they could seriously damage or kill the plants.


3. What is the application rate for Ammonium Sulfate to dissolve in water (foliar application)?

I recommending dissolving 1-3 tablespoons per gallon of water. You could either spray the leaves with Ammonium Sulfate solution or just water the plant. Please make sure not to over apply and to spray it when it's cool outside and not in direct sunlight because that could burn and damage your plants very easily.


4. Will Ammonium Sulfate fertilizer improve onion bulb growth?

Yes, it will. Any nitrogen fertilizer will improve the growth and Ammonium Sulfate contains 21% Nitrogen and we recommend using 1 tablespoon per 5 gallons of water and applying it weekly.


 5. How much area does a 25-pound bag of Ammonium Sulfate cover on Bermuda grass?

We recommend using 5 pounds per 1,000 sq.ft. so a 25-pound bag would cover about 5,000 sq.ft.


6. What does 21-0-0 mean? Does it mean this is very high in Nitrogen?

Fertilizers usually have 3 numbers, first one is a percentage of Nitrogen (N), the second one is a percentage of Phosphorous (P) and the third one is Potassium (K). We also have different kinds of Nitrogen (N) such as Ammonia and Nitrate and as it is obvious from the name Ammonium Sulfate contains 21% Ammonical Nitrogen (N), which is readily available Nitrogen (N) for plants. In addition, Greenway Biotech, Inc. Ammonium Sulfate contains 24% Sulfur (S) which is one of the most important micronutrients.

21% Nitrogen is not the highest Nitrogen fertilizer (for example, Urea 46-0-0 contains 46% nitrogen) but it is a relatively high Nitrogen (N) fertilizer.


7. Can this be used as oxygen scavenger?

No, Ammonium Sulfate is not an oxygen scavenger and you need Ammonium Sulfite for that.


8. What is the application rate of Ammonium Sulfate for lawns?

Apply 5 Pounds per 1,000 sq.ft. or 200 Pounds per Acre (application at the recommended rates will last about 4 to 6 weeks)