• Wear gloves when handling dry product to avoid skin irritation
• Use eye protection (safety glasses or goggles) during application
• Wear a dust mask when spreading dry product in windy conditions
• Wash hands thoroughly after handling

• Store in a cool, dry place in the original sealed container
• Product may absorb moisture if exposed — keep container tightly closed
• Keep out of direct sunlight and away from heat sources
• Keep away from children and pets

• Avoid direct contact with plant stems and foliage when applying to soil
• Water thoroughly after soil application to prevent root irritation
• Do not exceed recommended application rates
• When mixing with other fertilizers, check compatibility first — avoid mixing with calcium nitrate or high-calcium products

• Eye contact: Flush with clean water for 15 minutes. Seek medical attention if irritation persists
• Skin contact: Wash affected area with soap and water
• Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek medical attention
• Inhalation: Move to fresh air. Seek medical attention if symptoms persist

Refer to the Safety Data Sheet (SDS) for complete safety information.

K-Mag (Sulfate of Potash Magnesia) is a naturally occurring mineral fertilizer containing 22% potassium (K₂O), 11% magnesium (MgO), and 22% sulfur (S). Its unique triple-nutrient formula makes it exceptional for situations requiring potassium without nitrogen, particularly during fruit development and ripening stages. The low chlorine content (less than 2.5%) makes it safe for chlorine-sensitive crops like tobacco, potatoes, tomatoes, and berries. Unlike muriate of potash, K-Mag won't cause salt burn or chloride toxicity, making it ideal for high-value crops.

Choose K-Mag over other potassium sources when growing chlorine-sensitive crops (tobacco, potatoes, tomatoes, peppers, berries), when magnesium is also needed (saves an additional application), for late-season fertilization when nitrogen isn't desired, on sandy or acidic soils that often lack both magnesium and sulfur, or when crop quality is the priority over maximum yield. K-Mag also prevents grass tetany in pastures where magnesium is crucial for livestock health. For a deeper understanding of how potassium benefits your crops, see our guide on What's the Function of Potassium (K) in Plants?

K-Mag enhances crops through multiple mechanisms. Potassium (22%) regulates water uptake, improves drought tolerance, enhances fruit size and quality, and strengthens disease resistance. Magnesium (11%) is the central component of chlorophyll, essential for photosynthesis, improves phosphorus utilization, and prevents interveinal chlorosis. Sulfur (22%) is required for protein synthesis, enhances nitrogen efficiency, improves crop flavor and aroma, and increases vitamin content. The three nutrients work synergistically to improve overall plant metabolism and stress tolerance. Research shows K-Mag can increase potato yields by 10–15% while reducing internal brown spot and improving storage quality.

Look for these deficiency symptoms: potassium deficiency shows as yellowing or browning of leaf edges (marginal chlorosis), weak stems, poor fruit quality, and increased disease susceptibility. Magnesium deficiency appears as interveinal chlorosis (yellowing between green veins) on older leaves first, with reduced photosynthesis and poor fruit set. Sulfur deficiency causes uniform yellowing of young leaves (unlike nitrogen deficiency which affects older leaves), stunted growth, and delayed maturity. Soil tests showing K below 150 ppm, Mg below 50 ppm, or S below 10 ppm typically indicate K-Mag application would be beneficial. For more on magnesium deficiency symptoms and solutions, read What's the Function of Magnesium (Mg) in Plants?

Yes, K-Mag is compatible with most fertilizers including urea, ammonium sulfate, DAP, MAP, and most micronutrients. Avoid mixing with calcium nitrate or high-calcium fertilizers, as this may cause precipitation. When tank mixing, add K-Mag to water first, agitate well, then add other products. K-Mag can be applied with nitrogen early season or alone late season. It has minimal effect on soil pH, making it suitable for all soil types. For fertigation systems, K-Mag's complete solubility ensures no clogging of drip lines or sprinklers.

Manganese plays a crucial role in enhancing potassium uptake by activating enzymes involved in carbohydrate metabolism and root health. When manganese levels are adequate, plants develop more efficient root systems that are better equipped to absorb potassium. This is especially important in high-carb crops like potatoes and corn. For a detailed look at this nutrient relationship, see our article on Why High-Carb Crops Demand Plenty of Potassium (and How Manganese Can Help).

K-Mag (langbeinite) is a naturally mined mineral and is commonly accepted for organic production. However, always verify with your specific certifying body (such as OMRI or your local organic certification program) before use, as requirements can vary. Its natural origin and minimal processing make it a preferred potassium source for growers seeking environmentally responsible options.

• Sourced from premium-grade natural langbeinite mineral deposits
• Tested by independent third-party laboratories for purity and nutrient content
• Registered with the California Department of Food and Agriculture (CDFA)
• Rigorously tested for heavy metal content
• Manufactured and packaged in California, USA

If you're not completely satisfied, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging, and we'll process a full refund. No questions asked.

We're committed to sustainable practices, including:

• Recyclable packaging materials
• Natural mineral sourcing with minimal processing
• Slow-release formula reduces nutrient runoff and environmental impact
• Support for integrated pest management (IPM) practices

1% of all profits go to our foundation, focused on improving educational opportunities for children in agricultural communities.