Restoring Depleted Soil

What is the quickest way to bring an old used garden spot back into quick production? Spade in organic matter in the fall. In the spring, apply superphosphate, hoe, rake, and plant. Add complete fertilizer just before planting, and again during summer.

I have been raising flowers on the same ground for some time. What can I use to keep it in shape? Incorporate organic matter such as leaves or peat moss in the soil between the plants. Apply a good complete fertilizer as needed.

I have planted flowers in the same spot for the last 15 years, using only a commercial fertilizer. My flowers do not have as large blossoms as they used to, but bloom very well. Should I add anything more, or do as I am doing? Unless the soil is very rich, it would be beneficial to add compost or peat moss, or some other form of organic matter.