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Nature's Trifecta

Three crop-friendly nutrients balanced in every granule.

A trifecta
of benefits

K-Mag® contains a natural balance of potassium, magnesium, and sulfur in each granule ensuring that nutrients are spread uniformly across the field for maximum availability for every plant.

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    Unique mineral composition for balanced crop nutrition

    With a unique blend of potassium, magnesium, and sulfur in every granule, K-Mag allows for balanced crop nutrition across every acre.

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    Low chloride for sensitive crops

    Certain crops are sensitive to high levels of chloride. Unlike other potassium sources, K-Mag features a low salt index. Providing critical nutrition without damaging plants.

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    pH neutral for greater control

    Unlike traditional Mg or S sources, K-Mag’s unique make-up provides essential nutrients to crops without raising or lowering soil pH; regardless of application rate.

High-Yielding crops can be high-maintenance.

Crops benefit greatly from the right balance of potassium, magnesium and sulfur, but often the delivery of these nutrients can prove challenging — with the risk of unintended consequences like fertilizer “burn” and altered soil pH, particularly when it comes to sensitive plant varieties.

A safe and simple solution straight from nature.

K-Mag® is a naturally-occurring mineral that features a crop-friendly balance of potassium, magnesium and sulfur with low chloride levels and neutral pH. The result is a powerful crop fertilizer that safely, and evenly delivers the nutrition that high-yielding crops need to reach their full potential.

Three formulas
formed by nature

To suit the specific nutritional needs of your operation, K-Mag® is available in three different product offerings — Premium, Granular, and Standard.


Grow your
K-Mag know-how

To dig deeper into the crop nutrition behind K-Mag®, explore our full library of articles, research, and other resources.

K-Mag® Blend Study

Evaluate soybean yield response to MOP (0-0-60) and K-Mag® Premium (0-0-21.5-10.5Mg-21S).


Potassium Magnesium Sulfate: Langbeinite

Langbeinite is a unique source of plant nutrition, since three essential nutrients combine naturally into one mineral. It provides a readily available supply of Potassium (K), Magnesium (Mg) and Sulfur (S) to growing plants.


The Increasing Need For Supplemental Sulfur

The first occurrences of sulfur (S) deficiency in corn were reported in the 1960s. At the time, sulfur deficiency was virtually unheard of. Textbooks devoted chapters to nitrogen (N), phosphorus (P) and potassium (K) and their roles in crop production. Sulfur received only short paragraphs.

K-Mag® Corn Blend Study

Evaluate corn yield response to MOP (0-0-60) and K-Mag® Premium (0-0-21.5-10.5Mg-21S).


Sulfur Nutrition of Cotton

Sulfur is an essential component of two amino acids, methionine and cysteine. These amino acids are key building blocks needed for protein formation in the cotton plant. Research studies indicate that high-yielding cotton will take up nearly 40 pounds of S during the growing season. That’s about the same amount as magnesium (Mg) and about two-thirds of the phosphorus (P) needed for developing cotton roots, stems, leaves and bolls. A shortage of S can also trigger inefficient plant use of nitrogen (N), since both are required for protein development.


Soil Fertility and Compaction

Plant experts often say that high yields of good quality crops don’t result from any one factor (such as fertilizer application, or planting the best variety), but to a whole set of effective management inputs, generally defined as “best management practices.” Keeping the importance of best management practices top of mind, it’s instructive to consider the interactions of soil fertility and soil compaction in affecting plant growth.

K-Mag® Potato Study - PEI

Evaluate potato yield response to MOP (0-0-60), MOP + AS (21-0-0-24S), MOP + K-Mag® Premium (0-0-21.5-10.5Mg-21S).


Sulfate Sulfur vs. Elemental Sulfur Part I: There’s a Difference

- Sulfate-Sulfur is the only form of S the plant can utilize.
- Elemental S is dependent upon time, temperature and moisture to be available to the plant.
- Sulfate-Sulfur will not acidify the soil.

For various reasons, sulfur (S) deficiencies are increasing in many areas of the country. Consequently, fertility programs use this nutrient more routinely. The most common chemical forms of S used in fertilizers are sulfate S (SO₄²⁻) and elemental S (S⁰). But these two forms of S react quite differently in soils. It’s very important to understand the differences between SO₄²⁻ and S⁰ in order to use these two forms in the most effective manner possible.

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K-Mag® retailers are equipped with the latest information and can help you find the best options for your specific operation and crops.
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Earn CCA credits and gain a comprehensive understanding of K-Mag® when you take our interactive online learning courses at AgCollege Online.
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Explore the raw power of nature’s trifecta

Learn how K-Mag’s unique combination of crop-friendly potassium, magnesium, and sulfur make it safer and more effective option for sensitive and high-yield crop systems through a host of innate crop nutrition benefits.