Phosphate helps in photosynthesis, transporting nitrogen to the plant, and calcium helps build stronger plants. Soft Rock Phosphate is a 100% natural powder form of the element phosphorous, which plants need to grow strong and healthy. Soft Rock Phosphate is a great addition to any soil lacking this vital mineral and comes in this easy use to powdered base. Safe to store anywhere, Soft Rock Phosphate application is fast, efficient and can be used safely around people, pets and wildlife.

Also available in 50lb bags. Please contact us at 1-800-835-0123 for product price and shipping cost.

SKU: N/A Category:

How plants use Phosphorus:

Phosphorous is found in most soils with most phosphates being located at the soil surface. Phosphorus must go through the same type of cycle as Nitrogen, soil bacteria must break phosphorus down so plants can absorb it. Without this bacterial activity most phosphorus will go unused by plants.

Soil alkalinity also helps determine whether or not plants get enough phosphates.  Acid levels that are too high or too low will cause a chemical reaction to take place that locks up the phosphates and makes them unusable by plants.

Other factors that prevent plants from taking up phosphorus include: Extreme temperatures, Not enough organic material, Lack of Oxygen, or Too little soil moisture.



Light Application: 7 lbs per 1,000 square feet, 1/4 cup per plant or 1 lb per 20 ft row

Normal Application: 12 lbs per 1,000 square feet, 1/3 cup per plant or 2 lbs per 20 ft row

Heavy Application: 25 lbs per 1,000 square feet, 1/2 cup per plant or 3 lbs per 20 ft row

Derived from: Rock Phosphate

Weight N/A
Dimensions N/A

5 lbs, 25 lbs, 50 lbs


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.