Ammonium Sulphate 21-0-0 | Quick Nitrogen & Sulfur

The Lawn Medic | Fast-acting nitrogen fertilizer that delivers rapid green-up while supplying sulphur for healthy turf growth.

★★★★★ 4.8 stars on over 5,000 orders

Ammonium Sulphate 21-0-0 | Quick Nitrogen For Lawns

$29.00

SGN 150 Mini Prill Made for Canada Pro Grade Water Soluble Spreader Ready

"The fertilizer worked amazing. Lawn was super green all year. Will definitely be purchasing again." - Brent S.

Bag Size: 2kg

2kg
5kg
10kg

Product variants

Coverage (selected size)

Covers up to 5000 sq ft (also water soluble)

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

Mini Prill - SGN 150

Featuring smaller granule/prill size than big box store fertilizer producing faster and more even results as your fertilizer reaches your soil more quickly.

The "Nitro-Boost." When you need an immediate response, Ammonium Sulphate delivers. It provides quick-release nitrogen for rapid greening and sulfur to help lower soil pH and improve overall colour.

21-0-0

NPK

Mini - SGN 150

Prill Size

Granular

Application Type

Soluble

Application Type

Fast - 0% Slow Release

Nitrogen Release

Best For

Early spring "wake up" calls or fixing a nitrogen-deficient, yellowing lawn quickly.

What Makes It Different

This professional-grade nitrogen fertilizer uses a clean ammonium sulphate source with a uniform prill size for even distribution and predictable results. The addition of sulphur supports plant metabolism and improves nutrient availability in the soil. Compared to many consumer nitrogen fertilizers, ammonium sulphate delivers faster and more consistent green-up when lawns need an immediate boost.

Application Rate

0.2kg (0.5lbs) to 1.4kg (3lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 21%
• Sulfur (S) – 24%

Product Details

NPK | 21-0-0
Nitrogen Release | Fast | 0% Slow Release Nitrogen
Prill Size | Mini Prill | SGN 150 | Mini sized prills for more even applications
Application Type | Granular | Apply with any lawn spreader

Storage & Handling & Safety

Storage

We recommend keeping your seed in a cool dry location, especially after opening. This helps to maintain a high germination rate for an extended period of time.

Handling

Seed is safe to handle. However if you are sensitive to airborne particles you may want to wear a mask when adding your seed to a spreader for instance.

Shipping & Returns

Shipping

We ship Canada wide. Most orders are shipped with UPS. Canada Post is used for some locations.

Shipping on Grass Seed is always free. Shipping on fertilizers is calculated based on weight.If your order combines seeds and fertilizers you will only be charged for the weight of the fertilizer. We do our best to offer a balance between fast shipping and reasonable shipping rates.

We strive to ship all orders within 24hrs (48hours max).

Please reach out to use if you have any questions.

Returns

All of our products can be returned within 30 days as long as it is unopened/unused.

If you have a concern with your product after opening it please reach out to use as we always work to find a solution and rectify any issues.

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Valid on individual fertilizers only. Grass seed is always free shipping.

Pairs well with

In stock! Ships within 1-2 business days.

Expedited shipping on all orders.

Only professional grade fertilizers.

30-Day Return Policy

Ammonium Sulphate 21-0-0 | Quick Nitrogen For Lawns

2kg

$29.00

A Better lawn starts here

Don't Take Our Word For It

See what our happy customers are saying about how The Lawn Medic helped their lawns.

See All Our Reviews

Expedited Shipping on All Orders

Why This Fertilizer?

Ammonium sulphate is a highly effective nitrogen source that delivers fast, visible results in turfgrass. The nitrogen is readily available to plants, allowing lawns to green up quickly and resume active growth. In addition to nitrogen, this fertilizer also supplies sulphur, an important nutrient involved in protein formation and overall plant metabolism. This combination makes ammonium sulphate particularly useful for correcting nutrient deficiencies and improving turf colour. It is often used when lawns need a quick boost or when cooler soil conditions slow nutrient availability.

Technical Details

Ammonium sulphate is widely used in turfgrass management due to its rapid nitrogen availability and consistent plant response. Nitrogen is the primary nutrient responsible for chlorophyll production and leaf growth in turfgrass systems. Research from the Purdue University Turfgrass Science Program demonstrates that ammonium-based nitrogen sources can produce rapid improvements in turf colour and canopy density when applied during active growth.

In addition to nitrogen, ammonium sulphate provides sulphur, a secondary nutrient required for amino acid synthesis and enzyme function. Studies conducted through the Michigan State University Turfgrass Program have shown that sulphur availability can enhance nitrogen utilization efficiency in turfgrass plants. The combination of nitrogen and sulphur allows ammonium sulphate to provide rapid turf response while supporting key metabolic processes involved in plant growth.

See the difference

Geoff D.

"I used seed and fertilizer from The Lawn Medic in the Spring. The transformation over about 5 weeks was incredible. The pictures tell the story. The new lawn came in thick and green and it has stayed that way all year. No weeds. Strong growth."

Testimonials

"Best result I've ever had in reseeding my lawn. No more big box branded lawn seed with pathetic results. Next fall will be the backyard's turn."
— Jose C.

"Lawn looks freaking awesome in December 😄😄 Will definitely be ordering again in the spring."
— Daryl F.

"Despite this summer’s heat and drought, the lawn stayed healthy. The seed quality is noticeably better than what I’ve bought from big-box stores."
— Ryan C.

FAQs

Please read our FAQs page to find out more.

What makes your products better?

All of our products, including our seeds and fertilizers, were developed for professional uses. This means that you are truly getting the best of the best when it comes to lawn care products. Forget the big box store products and try what the pros use.

Do you provide guides on how to use your products?

Yes, of course we do. Take a look at our Guides page. We will be adding more guides and helpful tools soon as well.

Can you help me decide what I need?

Yes! We are here to help. Contact us anytime with your questions and we will get back to you within 1-2 days with some suggestions. We also have our Guides page which can answer some questions, and we have more helpful tools coming soon.

How can I get your products?

We ship Canada wide by UPS and Canada Post (it depends on the location). Every shipment is expedited to arrive as soon as possible, and ships within 1-2 days. We also have a pickup location in Burlington, Ontario.