Coastal Brand Oyster Shell Flour – 50 lb. bag of ground calcium carbonate (CaCO₃) by Core Calcium & Shell Products. Sold by the pallet (60 bags / 3,000 lbs.) at Rocky Mountain BioAg.
Oyster Shell Flour Soil Amendment

Coastal Oyster Shell Flour – Pallet | 60 × 50 lb. Bags | Freight Required

Regular price$521.00
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Coastal Oyster Shell Flour – Pallet Quantity is available for commercial growers, soil blenders, and large-scale agricultural operations requiring bulk calcium carbonate inputs. Each pallet contains 60 × 50 lb. bags (3,000 lbs. net) of micronized, ocean-derived oyster shell flour (CaCO₃).

⚠️ FREIGHT SHIPMENT REQUIRED: This product ships via LTL freight only. A freight quote will be provided after order placement. Rocky Mountain BioAg Freight Quote - CLICK HERE Estimated lead time is 3–7 business days depending on destination. A loading dock or forklift is recommended for delivery but not necessary.

Oyster Shell Flour delivers a sustained, multi-season release of plant-available calcium while gently raising and buffering soil pH over time — ideal for commercial crop production, custom soil blending, and large-scale no-till systems.

Pallet Details

  • Pallet Configuration: 60 × 50 lb. bags

  • Gross Pallet Weight: Approx. 3,060 lbs.

  • Shipment Type: LTL Freight - Freight Quotes - CLICK HERE

  • Lead Time: 3–7 business days after order confirmation

Key Benefits

  • Sustained Calcium Release: Steady, long-lasting supply of calcium (Ca) to strengthen plant cell walls, enhance root development, and prevent deficiency disorders like blossom end rot and tip burn.

  • Natural pH Buffer: Gently corrects acidic soils without harsh, rapid pH spikes associated with synthetic hydrated lime or quicklime.

  • Microbial Support: Biologically active soil microbes process the calcium carbonate, fostering strong soil microbiology and improving overall soil structure.

  • Ideal for Bulk Blending & Commercial Production: A foundational ingredient for custom soil mixing, raised bed construction, and broad-acre field applications.

  • 100% Natural: Ocean-sourced, chemical-free input suitable for sustainable, natural, and regenerative agriculture systems.

Technical Specifications

  • Product Format: Fine Ground / Flour (~20–100 mesh blend)

  • Primary Nutrient: Calcium (Ca) – Approx. 33% to 37%

  • Chemical Composition: Calcium Carbonate (CaCO₃)

  • Source Material: Natural Ocean Oyster Shells

  • Application Type: Soil Amendment / Soil Mix Additive / Broadcast

Recommended Application Rates

Broad-Acre & Commercial Field Crops
  • Rate: Apply 250 to 500 lbs. per acre, depending on soil test recommendations and baseline soil pH.

  • Best Practice: Apply ahead of high-calcium demand crops or cover crops to allow microbial breakdown. One pallet covers approximately 6–12 acres.

Custom Soil Mixes & Bulk Blending
  • Rate: 5 to 10 lbs. per cubic yard of bulk substrate.

  • Best Practice: Blend thoroughly with peat moss, coconut coir, compost, and aeration components prior to planting.

Q: How is this pallet order shipped?

A: All pallet orders ship via LTL freight. After your order is placed, our team will contact you with a freight quote and estimated delivery window. A loading dock or forklift at the delivery address is strongly recommended.

Q: Can I order less than a full pallet?

A: Yes — individual 50 lb. bags are available on our single-bag listing. Pallet pricing reflects bulk savings for commercial-scale purchases. Coastal Brand Oyster Shell Flour 50 Lbs. Bags - CLICK HERE

Q: What is the difference between Oyster Shell Flour and Oyster Shell Meal?

A: Oyster Shell Flour is ground to a fine mesh particle size, offering a significantly larger surface area so soil microbes can process and unlock calcium more quickly and uniformly throughout the root zone.

Biological... Beyond Organic®

Organic is just the start

RMBA is committed to provide natural and organic products that support healthy soils. Even if a product is not listed as 'organic' you can rest assured that it will help, not hurt your soil.