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Studies have shown that across a variety of crops and soil conditions, K-Mag® leads to higher-quality crops, and ultimately, higher yields than commodity fertilizer alternatives.

See K-Mag® in action with the AgriFacts® studies below.
Soybean Blend Study
K-Mag® + MOP vs. Control

Increased yield with K-Mag

Site Years:
Potato Study
K-Mag® + MOP vs. MOP

Increased yield with K-Mag

Site Years:
K-Mag® Blend Study
K-Mag + MOP vs MOP

Increased yield with a small amount of K-Mag in the blend

Site Years:
K-Mag® Onion Blend Study
K-Mag + MAP + MOP vs MAP + MOP

Increased yield with a small amount of K-Mag in the blend

Site Years:
Performance Acre – Corn Balanced Crop Nutrition
Aspire + Aspire with K-Mag

Increased yield with Aspire + K-Mag over Aspire

Site Years:
Which crop do you grow?

K-Mag® has been proven to be beneficial to a wide variety of crop types. Discover the unique impact that K-Mag’s trio of nutrients provides specific crops by exploring the detailed sections below.


Good soil fertility and proper soil pH are two of the most important factors impacting alfalfa yields. Continuous alfalfa production can rapidly deplete the soil of nutrients. Plus, proper soil pH ensures nitrogen-fixing bacteria can thrive. Supplying essential nutrients without increasing soil acidity, K-Mag® can dramatically boost alfalfa yields and profits.

Apples & Treefruit

Tree nutrition is probably the most important factor in a successful orchard operation. Studies show K-Mag® can: Improve leaf tissue K concentration, Increase soil K levels, Maintain leaf Mg levels, Increase soil Mg levels, Increase fruit size, and Decrease incidence of disease.


Successfully growing a high-quality citrus crop on a range of soil conditions requires increased nutritional management. In addition to soils that are naturally low in K and Mg, soils with high calcium (Ca) levels may further suppress K and Mg uptake, making it difficult to maintain a proper balance of soil nutrients. K-Mag® helps provide K and Mg in the appropriate balance, providing improved transportation of sugars into the fruit.


Balanced soil fertility is an absolute must for high-yielding corn production. Yields are often limited by low soil pH and nutrient deficiencies. Corn is a demanding crop, requiring as much K as it does nitrogen (N) – in some cases more than 200 lbs K2O/ac. High-yielding corn can also take up more than 30 lbs/ac of S and Mg. These "secondary" nutrients are certainly not secondary in importance to corn. Deficiency of S and Mg can limit the potential of the crop.


Raising a healthy, high-yielding cotton crop calls for a precise nutrient management plan that provides the right nutrients, at the correct rates at exactly the right time. During the spring, when heat units are low, cotton grows slowly and accumulates lower levels of nutrients. However, during peak growing months, June and July, the rapidly growing plant aggressively begins accumulating high levels of nutrients. Enhanced disease resistance and top quality fiber depends on proper soil fertility.


Whether chippers, bakers or fry guys, top quality potatoes require a ready source of essential nutrients to sustain rapid growth. In addition to removing large amounts of nitrogen (N), phosphorus (P) and K from the soil, potatoes have been shown to respond very favorably to the added Mg and S provided by K-Mag®. K-Mag® rates of 300 lbs/ac have been shown to dramatically increase yields of higher quality potatoes, increasing grower profits. Regular soil tests will help determine proper application rates.


Rice production is regarded by some as the single most important economic activity in the world since roughly half of the world’s population relies on it as a primary food source. Quality rice production demands balanced nutrient management for maximum yields and disease resistance.


Soil fertility often is overlooked on the production of soybeans, a crop known for its efficient use of residual nutrients. However, providing balanced nutrition, along with good soil pH, is critical to achieving proper nodule formation and yield. Adequete soil fertility helps reduce risks from weather stresses, diseases and nematodes. Soybeans require large amounts of crop nutrients, especially phosphorus (P) and K. A 70-bushel yield removes 51 lbs P2O5, 84 lbs K2O, 13 lbs Mg and 13 lbs S on a per acre basis. Regular soil testing will help determine the level of needed nutrients.

Sugar Beets

Research reveals that optimum sugar beet and sucrose production relies on a balanced fertilization program. Nitrogen (N), phosphorus and K requirements have received intense study. Optimum performance of these nutrients also requires a readily available supply of other essential elements, such as S and Mg, to ensure rapid plant growth for early canopy closure and for optimum photosynthesis efficiency for sucrose development.

Nutrient Removal with K-Mag

Up to 60% of your yield is dependent on soil fertility. And as crops continue to pull nutrients out of the soil, it’s more important than ever to invest in replenishing your fields with smart crop nutrition solutions like K-Mag®.

* Reported nutrient removal coefficients may vary regionally depending on growing conditions. Use locally available data whenever possible.
** DM = dry matter basis; otherwise moisture content is standard marketing convention or at the stated moisture content.
Last modified April, 2014

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