My most recent soil test in my flower bed showed that I have above optimal phosphorus levels. Since then I have tried to refrain from using fertilizers with P. The vast majority of fertilizers for flowering plants and bulbs seem to have high P numbers. The MSU lab recommended I use 1-0-3 ratios for fertilizer which I have done. Author Robert Pavlis, in his book “Compost Science for Gardeners: Simple Methods for Nutrient-Rich Soil,” says that excess phosphorus that builds up in the soil over time becomes rock phosphate which is unavailable to plants. https://joegardener.com/podcast/compost-science-gardeners-robert-pavlis/ Should I continue to avoid using fertilizers with phosphorus because there's plenty available for the plants already there or should I use specialized fertilizers like bulb fertilizer 9-9-6