OGS Soft Rock Phosphate 1kg

Soft Rock Phosphate is a mineral powder phosphate source providing slow-release phosphate that is long-lasting and doesn’t leach nutrients.

Its three central components are Phosphorus, Silica and Calcium, which are all interim to the plants’ growth and function. Adding SRP to your potting mix is a great way to improve soil tilth and structure.

Mixing directly into the soil: 

• We recommend a rate of 0.5 cups per 25L of growing medium for the first application and another 1/4 cup each subsequent cycle.