Calphos Soft Rock Phosphate (25 lb bag)

The 25 lb Calphos Soft Rock Phosphate bag offers a practical middle size for multiple beds, small orchards, and broader soil-building projects. This finely ground mineral amendment supplies slow-release phosphorus and calcium and is best incorporated into the root zone when a soil test identifies a need. It is a useful choice when a 5 lb bag will not provide enough coverage but the largest package would exceed the project’s needs.

• Approximately 20% P₂O₅, including 3% available phosphate
• Approximately 18% calcium
• Useful quantity for repeated or medium-scale applications

Organic status: This repackaged 25 lb size is not represented as organic or as listed or approved for certified organic production.

How Calphos Soft Rock Phosphate (25 lb bag) fits a fertility plan

• Provides phosphorus to support root development, flowering, seed formation, and fruiting when soil levels and crop demand justify an application.
• Its low or zero nitrogen analysis can fit programs that need phosphorus without a large additional nitrogen input.
• The package size and formulation shown in the title help match the product to planting holes, beds, containers, orchards, or larger areas as allowed by the label.

Application guidance: Phosphorus moves slowly in many soils and can accumulate when overapplied. Use soil-test results, place or incorporate only as directed, and account for phosphorus already supplied by compost and other fertilizers. Follow label rates for the specific crop and growth stage.

Compare related phosphorus fertilizers when building a complete program.