Bloom in the Big Apple: NYC Gardener Test 2026 – Cultivate Your Success!

Phosphorus fertilizers like superphosphate supply phosphate to plants, supporting root growth and development. It is not a pesticide and it does have nutrient value. The key point is how phosphate moves in soil: phosphate ions tend to strongly bind to soil particles and are relatively immobile, so they don’t travel far or quickly through the soil profile. Most of the available phosphorus stays near the surface where it’s applied, moving downward only slowly with water. That’s why the statement about penetrating the soil very slowly is the most accurate. While some immediate availability can occur, the deeper movement through soil happens gradually, which is why it isn’t described as penetrating the soil quickly.