NPK Industries RAW Calcium/Mag 9-0-0 Supplement

NPK Industries RAW Calcium/Mag 9-0-0 is a highly concentrated, fully water-soluble plant supplement containing 15% calcium and 3% magnesium. Formulated from calcium nitrate and magnesium sulfate, it helps prevent or correct two of the most common mineral deficiencies encountered in soil, coco coir and hydroponic cultivation.

The balanced formula supplies calcium for strong cell development and root growth, magnesium for chlorophyll production and photosynthesis, and a controlled amount of nitrate nitrogen to support nutrient uptake. Its concentrated powder dissolves rapidly and can be incorporated into nearly any compatible base fertilizer program.

Key Benefits

• Concentrated calcium and magnesium: Supplies 15% calcium and 3% magnesium in a highly concentrated powder.
• Corrects common deficiencies: Helps address calcium- and magnesium-related symptoms in actively growing plants.
• Strengthens plant structure: Calcium supports cell-wall formation, growing tips, roots and developing plant tissue.
• Supports photosynthesis: Magnesium occupies the central position in the chlorophyll molecule and is essential for light capture.
• Improves nutrient metabolism: Magnesium activates enzymes involved in energy transfer and plant metabolism.
• Bloom-stage compatibility: Provides calcium, magnesium and a controlled amount of nitrate nitrogen without functioning as a high-nitrogen vegetative fertilizer.
• Clean dissolution: Fully water-soluble for efficient incorporation into reservoirs and irrigation solutions.
• Highly economical rate: Requires only a small amount per gallon compared with many liquid Cal-Mag supplements.
• Universal compatibility: Suitable for soil, coco coir, soilless media, hydroponics and fertigation.

Guaranteed Analysis

• N-P-K: 9-0-0
• Total Nitrogen: 9%
• Calcium: 15%
• Magnesium: 3%
• Calcium-to-Magnesium Ratio: 5:1 by percentage

The formula is derived from calcium nitrate and magnesium sulfate. RAW Calcium/Mag is a mineral supplement and does not replace a complete base fertilizer.

How Calcium Supports Plant Health

Calcium is an essential component of plant cell walls and newly developing tissue. It supports structural strength, healthy root growth and the development of growing tips, flowers and fruit.

Because calcium has limited mobility within plants, deficiency symptoms frequently appear in new growth first. Symptoms may include distorted young leaves, weak growing tips, reduced root development, blossom end rot in fruiting crops or tip burn in leafy vegetables.

RAW Calcium/Mag can help prevent these disorders when insufficient calcium is the underlying cause. Similar symptoms may also result from poor transpiration, high humidity, irregular watering, root damage or improper pH, so growing conditions should be evaluated before increasing the fertilizer rate.

How Magnesium Supports Plant Health

Magnesium is the central element within the chlorophyll molecule, making it essential for photosynthesis and plant energy production. It also activates numerous enzymes involved in nutrient metabolism and cellular energy transfer.

Magnesium deficiency commonly appears as interveinal chlorosis on older leaves, where the tissue between the veins turns yellow while the veins remain green. Excess potassium, improper root-zone pH or mineral imbalance can also restrict magnesium uptake even when magnesium is present in the fertilizer solution.

How to Use

Add RAW Calcium/Mag to water or a prepared nutrient solution at the following rate:

• Preventive or Light Supplementation: Use 1/16 teaspoon per gallon.
• Higher-Demand or Corrective Feeding: Use up to 1/8 teaspoon per gallon.
• Application Frequency: Apply as needed according to plant response, source-water mineral content and the applicable feeding chart.

Begin with the lower rate when using reverse osmosis water, treating sensitive plants or adding RAW Calcium/Mag to an unfamiliar fertilizer program. Increase only when plant response and EC or PPM readings indicate additional supplementation is appropriate.

Official RAW Program Timing

The NPK Industries RAW soil and coco schedule incorporates Calcium/Mag during vegetative growth and through much of flowering. The chart generally uses the higher 1/8-teaspoon rate during active growth and early-to-middle flowering, then reduces supplementation later in the flowering cycle.

Follow the current chart associated with the selected RAW base fertilizer. The ideal amount may change with source water, plant variety, growing medium and the calcium and magnesium already supplied by other fertilizers.

Recommended Mixing Instructions

1. Fill the reservoir or watering container with fresh water.
2. Measure the powder carefully with a clean, dry measuring tool.
3. Pre-dissolve RAW Calcium/Mag in a small amount of water.
4. Add the dissolved supplement to the main reservoir or watering solution.
5. Mix thoroughly before adding other fertilizers or supplements.
6. Add remaining products individually, mixing between additions.
7. Measure the final EC or PPM.
8. Check and adjust pH after all fertilizers have been added.

Never combine RAW Calcium/Mag directly with dry phosphate fertilizers or undiluted nutrient concentrates. Concentrated calcium can react with phosphorus or sulfur-containing fertilizers and form insoluble mineral deposits.

Using It With RAW Grow and RAW Bloom

RAW Calcium/Mag may be used alongside RAW Grow or RAW Bloom when plants, source water or growing media require additional calcium and magnesium.

The official RAW all-in-one schedule includes Calcium/Mag at selected stages, even though the base formulas supply a broad range of essential nutrients. Use the appropriate chart rate and consider the mineral content of the source water before supplementing.

During flowering, RAW Calcium/Mag can provide additional calcium and magnesium without adding the heavy nitrogen concentration associated with a full vegetative fertilizer. The manufacturer states that its controlled nitrate content is suitable through bloom and is not intended to trigger unwanted plant stretch.

Coco Coir and Reverse Osmosis Water

Coco coir can retain calcium and magnesium through cation exchange, reducing the amount immediately available to plants. Reverse osmosis and distilled water also contain little or none of the mineral content found in untreated water.

RAW Calcium/Mag may be especially useful in these applications. Start at a conservative rate, measure the completed nutrient solution and monitor runoff EC or PPM in coco to prevent mineral accumulation.

Preventing Nutrient Imbalances

More Cal-Mag is not always better. Excess calcium can interfere with magnesium, potassium and other nutrients, while excessive magnesium can compete with calcium or potassium uptake.

Before increasing the rate, inspect:

• Root-zone pH
• Input and runoff EC or PPM
• Source-water mineral content
• Irrigation frequency
• Drainage and root health
• Temperature and humidity
• Calcium and magnesium already contained in the base fertilizer

Correcting the underlying growing condition is often more effective than repeatedly increasing fertilizer strength.

Growing Media and System Compatibility

RAW Calcium/Mag is suitable for:

• Soil and container gardens
• Coco coir
• Peat-based and soilless media
• Deep water culture
• Recirculating hydroponics
• Drain-to-waste systems
• Drip irrigation and fertigation
• Flood-and-drain systems
• Other compatible reservoir-based applications

Ensure the powder has dissolved completely before operating fine emitters or irrigation equipment.

Important Usage Notes

• Use as a supplement alongside a complete base fertilizer.
• Begin with the lower application rate and increase only when needed.
• Do not assume every yellowing or leaf disorder is a Cal-Mag deficiency.
• Never combine concentrated calcium products directly with phosphate-heavy nutrients.
• Monitor total EC or PPM when adding it to an established feeding program.
• Reduce or discontinue supplementation if the base fertilizer and source water already provide sufficient calcium and magnesium.
• Store tightly sealed in a cool, dry location away from moisture.
• Keep out of reach of children and pets.