MAP 10-50-0 Phosphorus Fertilizer | Root Builder

The Lawn Medic | High-phosphorus fertilizer designed to promote rapid root establishment.

★★★★★ 4.8 stars on over 5,000 orders

Phosphorus 10-50-0 MAP | Root Builder

$35.00

SGN 150 Mini Prill Pro Grade Made for Canada 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 4400 sq ft

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.

Strong root support all season long. This 10-50-0 monoammonium phosphate fertilizer provides a concentrated phosphorus punch to support rooting, establishment, and recovery—especially for new seed and stressed turf. It is also a great choice soil amendments when Phosphorus is low.

10-50-0

NPK

Mini - SGN 150

Prill Size

Granular

Application Type

Best For

New seeding, transplanting, poor-rooting areas, Phosphorus deficiency and early-season root development.

What Makes It Different

Monoammonium phosphate (MAP) is a highly efficient phosphorus source used widely in professional turf and agriculture. Phosphorus is essential for root development, energy transfer, and plant establishment. MAP provides phosphorus in a form that plants can readily absorb, making it particularly valuable during seeding or early growth stages.

Application Rate

0.5kg (1lb) to 0.9kg (2lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 10%
• Available Phosphoric Acid (P₂O₅) – 50%

Product Details

NPK | 10-50-0
Nitrogen Release | Balanced | Works to quickly to improve soil composition
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

Phosphorus 10-50-0 MAP | Root Builder

2kg

$35.00

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.

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Why This Fertilizer?

Phosphorus fertilizers are essential during the early stages of plant growth when strong root development is critical. Phosphorus supports energy transfer within plant cells and plays a central role in root formation and early plant establishment. This makes high-phosphorus fertilizers particularly valuable when seeding new lawns, overseeding existing turf, or installing sod. By encouraging deeper and more extensive root systems, phosphorus helps young plants access water and nutrients more effectively. Strong roots also improve long-term turf density and resilience. Using a high-phosphorus fertilizer during lawn establishment helps ensure that young turf plants develop the foundation they need for healthy, long-term growth.

Technical Details

Monoammonium phosphate (MAP) is one of the most commonly used phosphorus fertilizers in turfgrass establishment programs. Phosphorus plays a key role in root development, energy transfer, and cellular metabolism. Research conducted through the University of Wisconsin Turfgrass Science Program has demonstrated that phosphorus availability is critical during turfgrass establishment.

MAP provides phosphorus in a form that is readily available for plant uptake. Studies from the Penn State Center for Turfgrass Science show that phosphorus fertilization during seeding can significantly improve root development and early plant establishment.

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.