Questions about organic sources of phosphorus
My soil tests indicate that I need to increase phosphorus levels. The recommendation I received with the soil test was to add 1.0 lb per 100 sq ft of 0-46-0.
I know that bone meal and rock phosphate are both sources but the calcium reading on the test was also really high, so I'm concerned about adding more calcium via bone meal (does rock phosphate have a lot of calcium as well? Any drawbacks to rock phosphate?)
If I use rock phosphate, I'm unsure of the rate at which I should be applying it - I was going to order off amazon and there are no instructions in the description.
Any tips would be greatly appreciated!
Also - What do people use to raise just the phosphorus levels on lawn? Can I use rock phosphate here as well? Or would you need massive amounts - we have a large lawn and I don't want to be deadlining with several hundred pounds of fertilizer.