Spotlight on: K-Mag®
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Spotlight on: K-Mag®

November 13, 2018   |   ShareThis

With decades of history, K-Mag® is a brand our retail customers and farmers trust to provide balanced crop nutrition to a variety of high-value crops.

New Mexico has the largest known quantity of potash in the U.S. The K-Mag mine in Carlsbad, NM has the distinction of being the oldest and longest-producing asset in The Mosaic Company’s potash portfolio. In 2019, we will be celebrating K-Mag’s 80th anniversary, a testament to the value of the product that stands the tests of time.

What makes K-Mag unique?

K-Mag is comprised of langbeinite, a naturally occurring water-soluble source of three important plant nutrients: potassium, magnesium and sulfur. What makes K-Mag an invaluable resource to farmers is its unique low-chloride and nutrient-dense structure, while also delivering water-soluble magnesium for cropping systems to increase yields.

High-value fruits and vegetables that require large quantities of potassium, magnesium and sulfur but are also chloride-sensitive are particularly benefited by K-Mag. Among these includes potatoes, citrus, rice and many other key crops.

Grades of K-Mag

Mosaic produces three varieties under the K-Mag brand. Our largest volume product is K-Mag Premium, which is a granulated product that provides a uniform granule, ideal for blending with other fertilizers.

We also sell K-Mag Granular, which is a natural crystal that can be used in blends or applied straight to the field. K-Mag Standard is used for direct application.

% of Sales K-Mag Product
60% Premium
30% Granular
10% Standard


In the United States, K-Mag sales are concentrated in the southeast and the Pacific Northwest. Internationally, we have customers in eastern Canada, Latin and South America, China, India and Southeast Asia.

We are on track to produce and sell roughly 700,000 short tons of K-Mag in 2018. Recent investments at Carlsbad have enabled us to grow K-Mag volumes in the last two years, and we anticipate significant growth to bring the mine to full production capacity in 2019.

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