Phosphorus is an essential nutrient required for plant growth that is generally present in the environment, but largely unavailable for uptake by the plant. Phosphorus that is present in the soil, both naturally and applied through fertilization, tends to dissipate quickly by leaching into water, becoming biologically bound in organic forms, or forming insoluble complexes which the plant cannot process. The phosphorus solubilizing bacteria (PSB) found in Spectrum PSB break down these bound or insoluble forms of phosphorus, making them available for use by the plant.
The following are maximum one-time application rates. If budget-constrained, I suggest cutting the application rates and applying more frequently throughout the season.
Mix 1 tsp. to 1 Tbsp per gallon of water.
Apply every 7-10 days through drip irrigation or apply 8 oz. per plant around the root zone for 6” pots, 32 oz. per 5 gallon pot, 64 oz. per 10 gallon pot, etc.
Pre-Plant Propagation Inoculation and Starter Program
Mix 1 tsp. to 1 Tbsp in 10 gallons of water to soak plugs or soil prior to propagation.
Lightly mist new seedlings with a mixture of 1 oz. per gallon of water in conjunction with trace minerals.
Repeat weekly after plants are 12-15” high and have at least three full sets of leaves.