PHOSPHORUS (P) is an essential plant nutrient supporting root growth, flower development and the productivity of fruit and seed crops. Most fruiting and flowering plants require moderate to high levels of phosphorus for the proper development of seeds and fruits. Rock Phosphate is one of the best natural sources of phosphorus (P) and calcium (Ca).
Contains 20% available Phosphorus (P205 ) with 30% Calcium (Ca)
Rock phosphate should be worked into the soil prior to planting or can be applied with other organic amendments. Unlike chemically made phosphates, rock phosphate is insoluble in water, will not leach away, and therefore is long-lasting.
Annual plants absorb up to 60 percent of its total phosphate needs within the first few weeks of its life. Rock phosphate can be applied when planting seeds or when transplanting. It is almost impossible to overuse soft rock phosphate, you can grow beautiful plants directly in it without any harmful effects.
- Amending soil: Apply up to 5 lbs. / 100 sq.ft. or 1 ton / acre on phosphate deficient soils, and less on fertile soils. If planting in rows, mix with the seed or starter plant and apply up to 1 lb. per 50 ft of row.
- Trees and perennials: Apply 1 - 10 lb. per planting hole, depending on plant size.
- Transplants: 1 - 2 tablespoons per 4-6" planting hole.
- Potted plants: Mix 1 teaspoon per 2" pot diameter with potting soil before planting.