I use Lawn Synergy AS
"I use Lawn Synergy AS for smaller spoon feeding between my scheduled 20-0-10 applications every 6 weeks. Definitely helps keep that deep green color, but get ready to mow more frequently."
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Ammonium Sulfate 21-0-0 Fertilizer
Ammonium Sulfate 21-0-0 Fertilizer gives your lawn a fast nitrogen boost for deep green color, stronger growth, and improved turf density. With added sulfur, it helps support rich lawn color and better nutrient performance during the active growing season.
$39.99
Make It Easy – Auto Delivery Program
Fast-Acting Nitrogen with Added Sulfur — Ideal for High pH Soils.
21-0-0 Ammonium Sulfate delivers 21% fast-release nitrogen along with 24% sulfur, making it an excellent choice for lawns that need quick green-up while improving nutrient availability in alkaline soils.
This is a preferred nitrogen source for experienced lawn enthusiasts and professionals who want reliable performance without the volatility concerns of urea.
Why Choose Ammonium Sulfate Over Urea?
- Lower volatilization risk compared to urea
- Helps lower soil pH over time in alkaline soils
- Improves iron availability for deeper green color
- Excellent for spoon-feeding programs
- Fully soluble for liquid applications
If you have high pH soil or struggle with yellowing turf despite fertilizing, ammonium sulfate is often the better nitrogen source.
Best Used For
- Correcting nitrogen deficiency
- Summer feeding programs
- High pH or alkaline soils
- Liquid lawn applications
- Boosting color before events or peak growth periods
Application Rates
Maximum recommended nitrogen rate: 1 lb N per 1,000 sq ft per application.
- 18 lbs. covers up to 7,560 sqft
- 50 lbs. covers up to 21,000 sqft.
Water in after application for best results.
Liquid or Granular
- Dissolves easily for spray applications
- Can be applied granular with a broadcast spreader
Looking for controlled-release nitrogen? Consider our professional blended fertilizers for longer feeding and reduced burn risk.
| Key | Value |
|---|---|
| Active Ingredient | Ammoniacal Nitrogen (N) 21% Sulfur (S) 24% Derived from Ammonium Sulfate |
| Lawn Types | Tall fescue, Bermuda, Zoysia, St. augustine, Centipede, Kentucky bluegrass, Ryegrass |
| Special Features | Granular |
| Application Rate | |
| Time to Apply | Spring, Summer, Fall, Winter |
| Delivery System | Dispersible Granules |
| Brand | Lawn Synergy |
| For Use In | Turf Grass, Landscape Beds, Vegetable Gardens |
Overall rating: 4.75 / 5 from 20 reviews.
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Reviews
My line is better than
"My line is better than expected wonderful product. I even told my neighbors and some of my family. You got a good thing thank you."
Really great product and my
"Really great product and my lawn geern"
"I know this product!! Gurantee green grass. . . just follow instructions"
Haven’t retested soil
"Haven’t retested soil"
Didnt do anything for
"Didn't do anything for my lawn, (Bermuda). Nothing, didnt make it greener or give it growth. No more than any other fertilizer I've used. I'm totally dissatisfied with this one. Maybe one of your other product will work, but I will never know."
So Far So Good
"I believe using a Scott Spreader that I place too much at a setting of 5. Please tell me what setting I should use. So far so good."
Sulfate of Ammonia
"Good Quality prodct."
Fast shipping, low prices, high quality!
"Ordered some high sulfur based lawn fertilizer and the price was excellent. Shipping was fast and free and the product was high quality and easy to work with. I plan on ordering again from Lawn Synergy!"
Fast shipping, low prices, high quality!
"Ordered some high sulfur based lawn fertilizer and the price was excellent. Shipping was fast and free and the product was high quality and easy to work with. I plan on ordering again from Lawn Synergy!"
Q&A
- How much liquid per 1,000 sq foot ? I will be using my ego sprayer.
- It will depend on the spray rate. How many gallons per 1,000 sqft is your spray rate?
- I purchased from you 2 18lb bags of the above sprayable fertilizer. I have approx 14,500 square feet. I want to apply with my 20 gallon pull behind sprayer. How much fertilizer do I use per 20 gallons of water.
- Can you reach out to us directly at support@lawnsynergy.com We need more information to be able to assist you.
- Can I use 20-0-0 on my lawn in this time of year live in North Carolina when it is hot
- If you do, use the half rate, you're in the transition zone as I am as well. We've had plenty of rain to sustain a a lush lawn and though it's been hot the rain contributes to less drought and stress
- Can I use 20-0-0 on my lawn in this time of year live in North Carolina when it is hot
- My answer is yes l. I would apply in the coolest part of the day and then water it in, just before a rainstorm worked well fior me
- Can I use 20-0-0 on my lawn in this time of year live in North Carolina when it is hot
- No, this could cause burning due to high heat and higher nitrogen content. I would recommend using Emerald 10-0-20 instead for this time of the year.