Rock Phosphate

This is a granular Rock Phosphate that is one of the best natural sources of phosphorus (P) and calcium (Ca). 

First Option A for Rock Phosphate contains 7% immediately available Phosphorus (P₂0₅ ), Total Phosphorus is 20% averages 30% Calcium (Ca)

Second Option B for Rock Phosphate contains 3% immediately available Phosphate (P₂0₅ ), Total Phosphorus is 20% averages 20% Calcium (Ca)

Both options offer numerous trace minerals for up to 5 years after application, depending on the crop and soil conditions.    Phosphate is immediately available to plants and will act as a long-term source of phosphorus.  Rock Phosphate should be plowed under or turned into the soil.  Unlike chemically made phosphates, rock phosphate is insoluble in water, will not leach away, and therefore is long-lasting.

Annual plants absorb up to 60 percent of its total phosphate needs within the first few weeks of its life.  If it does not receive phosphate then it is always behind and never catches up. Rock phosphate used directly under the seed or transplant at planting time is the very best method of application, especially in low acid or high alkaline soils.  It is not as critical but still beneficial in slightly acidic to neutral soils.  It is almost impossible to overuse soft rock phosphate, you can grow beautiful plants directly in it without any harmful effects.

Rock phosphate should be applied and worked into the soil prior to planting along with other organic amendments.  In alkaline soils, apply the phosphate directly under the seed or transplants so the small roots don’t have to search for it.  This is especially important in the spring.