Calphos Soft Rock Phosphate - Regular Powder (50 lb)

Calphos Soft Rock Phosphate in the original 50 lb package is a slow-release source of phosphorus and calcium for larger gardens, orchards, farms, and soil-building programs. It is especially useful where a soil test identifies low phosphorus and the amendment can be incorporated into the root zone. The bulk quantity reduces the need to purchase several smaller bags for ongoing, seasonal, or wide-area work and is easier to plan for at farm scale.

The material averages approximately 20% P₂O₅, including 3% available phosphate, and about 18% calcium. Its finely ground form can be blended into soil or compost before planting.

• Bulk quantity for larger areas and repeated applications
• Supports root, flower, and fruit development where phosphorus is deficient
• Slow nutrient release helps keep phosphorus in the amended soil zone
• OMRI listed and CDFA approved for use in certified organic production

Use a current soil test to determine whether phosphorus is needed and to select an appropriate rate. This organic-use status applies to the original 50 lb package only; the 5 lb and 25 lb repackaged sizes are not represented as organic.