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Wicked Organics Sul. of Potash Magnesia Guide


How to Apply Sul. of Potash Magnesia NCO Organic

To maximize the benefits of Sul. of Potash Magnesia NCO Organic (also known as K-Mag or langbeinite), follow these steps for effective application:

  1. Determine Application Rate: Refer to the product label for specific rates, typically ranging from 200 to 400 pounds per acre for field crops. For smaller areas, such as gardens or containers, adjust proportionally (e.g., 0.5–1 pound per 100 square feet). A soil test is recommended to tailor the rate to your soil’s nutrient needs.

  2. Timing: Apply at the start of the growing season or during active plant growth (e.g., early spring or early summer). Avoid application during heavy rain to prevent nutrient runoff.

  3. Prepare the Area: Clear debris from the application area and ensure the soil is moist but not waterlogged. For lawns or gardens, mow or till lightly if needed to improve nutrient penetration.

  4. Application Method:

    • Broadcasting: Use a spreader to evenly distribute the granular fertilizer across large areas like lawns or fields.

    • Banding: Place the fertilizer in bands near plant roots for targeted application in row crops or garden beds.

    • Incorporation: Mix into the top 2–4 inches of soil for better nutrient availability, especially in gardens or raised beds.

  5. Watering: Water the area thoroughly after application (about 1/4–1/2 inch of water) to dissolve the granules and aid nutrient uptake by plant roots.

  6. Safety Precautions: Wear gloves and, if needed, a mask during application. Keep pets and children away from the area until watered in and dry. Store unused product securely.

  7. Monitoring: Observe plant growth over the next few weeks for signs of improved vigor or nutrient deficiencies. Conduct follow-up soil tests to adjust future applications.

Always follow the manufacturer’s instructions and consider a soil test to ensure precise nutrient management.

FAQ About Sul. of Potash Magnesia NCO Organic

What is it made of?

Sul. of Potash Magnesia NCO Organic, commonly known as K-Mag or langbeinite, is a naturally occurring mineral fertilizer composed of:

  • Potassium (K, ~22%): Supports water regulation, enzyme activation, and photosynthesis, enhancing plant health and stress resistance.

  • Magnesium (Mg, ~11%): Essential for chlorophyll production and photosynthesis, aiding nutrient uptake.

  • Sulfur (S, ~22%): Crucial for protein synthesis, enzyme function, and formation of vitamins and amino acids.

These water-soluble nutrients are readily available for plant uptake, and the “NCO Organic” designation indicates certification for organic agriculture.

Is it organic or OMRI-listed?

The “NCO Organic” in the product name suggests it is marketed as organic. To confirm OMRI listing, check the product label for the OMRI seal or verify on the Organic Materials Review Institute’s website. If unclear, contact the manufacturer for certification details.

What is the NPK ratio?

The NPK ratio of Sul. of Potash Magnesia NCO Organic is 0-0-22, indicating 0% nitrogen (N), 0% phosphorus (P), and 22% potassium (K). It also provides ~11% magnesium and ~22% sulfur as secondary nutrients.

Does it contain secondary nutrients?

Yes, the product contains secondary nutrients: magnesium (11%) and sulfur (22%). Magnesium supports chlorophyll production, while sulfur aids protein synthesis and enzyme function.

Does it provide micronutrients?

No, Sul. of Potash Magnesia NCO Organic primarily provides macronutrients (potassium) and secondary nutrients (magnesium, sulfur). It does not typically include micronutrients like iron, zinc, or boron. Supplement with other products if micronutrients are needed.

What is the form (granular, powder, liquid)?

The product is in granular form, suitable for even distribution using a spreader or manual application in gardens and fields.

Is it natural or processed?

Sul. of Potash Magnesia is a naturally occurring mineral (langbeinite) mined from the earth. Minimal processing is involved to refine it for agricultural use, making it a natural product.

Is it synthetic-free?

As a naturally sourced mineral labeled “NCO Organic,” it is likely synthetic-free. Confirm with the manufacturer or check for organic certification to ensure no synthetic additives are present.

What is it used for?

This fertilizer supplies potassium, magnesium, and sulfur to enhance:

  • Potassium: Improves disease resistance, water efficiency, and fruit/flower quality.

  • Magnesium: Boosts photosynthesis and nutrient uptake.

  • Sulfur: Supports protein synthesis and crop flavor.


    It is ideal for organic farming, promoting plant vigor, yield, and quality in various crops.

What plants or crops is it best for?

The product is suitable for:

  • Fruits and Vegetables: Enhances quality in tomatoes, potatoes, peppers, carrots, and leafy greens.

  • Orchards and Vineyards: Improves fruit yield in apples, citrus, grapes, and berries.

  • Field Crops: Benefits corn, soybeans, and wheat with potassium and magnesium.

  • Turf and Lawns: Promotes strong roots and green color.

  • Flowers and Ornamentals: Enhances bloom quality in roses and azaleas.

What is the recommended application rate?

General rates are 200–400 pounds per acre for field crops or 0.5–1 pound per 100 square feet for gardens. Adjust based on soil tests and crop needs, following the product label.

How often should it be applied?

Apply at the start of the growing season and every 4–6 weeks during active growth, depending on soil tests and plant needs. Follow manufacturer guidelines to avoid over-application.

Does it need to be mixed with other amendments?

It may need supplementation with nitrogen or phosphorus fertilizers if soil tests indicate deficiencies. For soil pH or organic matter needs, add lime, sulfur, or compost as necessary.

Is pre-charging required before use?

No pre-charging is required. Apply directly to the soil as per label instructions, ensuring adequate soil moisture for nutrient release.

Is it suitable for containers, raised beds, or field crops?

  • Containers: Suitable with careful application to avoid over-fertilization.

  • Raised Beds: Effective for vegetables and herbs, supporting nutrient needs.

  • Field Crops: Ideal for crops like potatoes, tomatoes, and corn requiring potassium and magnesium.

What are the expected plant growth benefits?

  • Potassium: Enhances photosynthesis, water efficiency, disease resistance, and fruit/flower quality.

  • Magnesium: Boosts chlorophyll production and nutrient uptake.

  • Sulfur: Supports protein synthesis, enzyme function, and crop flavor, improving yield and quality.

Does it improve soil structure?

It indirectly improves soil structure through healthier root systems but is not designed for this purpose. Add organic matter (e.g., compost) for direct soil structure improvement.

Does it enhance water retention?

It does not directly improve water retention but supports plant health, aiding drought tolerance. Use organic matter for better moisture retention.

Does it improve nutrient holding capacity?

It indirectly enhances nutrient availability through plant health but does not significantly increase soil cation exchange capacity. Add organic matter or biochar for better nutrient retention.

Does it support microbial life?

It does not directly support microbial life but promotes plant health, which can increase organic matter from roots. Add compost or bio-stimulants for direct microbial support.

Does it buffer pH or improve soil chemistry?

It is pH-neutral and does not buffer soil pH. It improves soil chemistry by supplying potassium, magnesium, and sulfur, enhancing fertility with proper use.

How fast does it work?

Nutrients are water-soluble, with effects visible within a few weeks (e.g., improved greening or vigor). Full benefits develop over the growing season.

Does it help reduce runoff or leaching?

It reduces runoff risk through balanced nutrient supply and improved plant uptake. Proper application timing and rates further minimize leaching.

Is it safe for pets and children?

Generally non-toxic but avoid ingestion. Keep pets/children away during application, water thoroughly, and allow the area to dry before re-entry. Store securely.

Does it have an odor?

It has little to no odor, making it user-friendly for gardening and agricultural applications.

Is it USDA Organic compliant?

The “NCO Organic” label suggests compliance with USDA Organic standards. Check for the USDA Organic seal or contact the manufacturer for certification confirmation.

Is it safe for edible plants?

Yes, it is safe for edible plants when applied per label instructions, especially given its organic certification. Avoid over-application to maintain soil balance.

Are there environmental risks?

Minimal risks if used correctly:

  • Runoff: Avoid over-application or application before heavy rain.

  • Soil Imbalance: Use soil tests to prevent nutrient buildup.

  • Mining Impact: Minimal environmental impact from mining compared to synthetic fertilizers.


    Follow best practices to minimize environmental impact.

What is the packaging type?

Typically sold in a 25 kg bag. Confirm with the manufacturer or retailer for specific packaging details.

How long does it last once applied?

Nutrients last 3–6 months, depending on soil and environmental conditions. Reapply based on soil tests and crop needs.

How should it be stored?

  • Store in a cool, dry place in a sealed container.

  • Keep away from sunlight, moisture, and incompatible chemicals.

  • Store out of reach of children and pets.

Where is it sourced or manufactured?

Sourced from natural langbeinite deposits, often in New Mexico, USA. Contact the manufacturer for specific sourcing or production details.

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