Table 2 - Sources of Phosphorus | |
Fertilizer Name, Total Phosphorous (P2O5) (%), Water Solubility (%)
Phosphate Rock, 25-35, 0-10
Phosphoric Acid, 40-54, 100
Superphosphoric Acid, 69-72, 100
Normal Superphosphate, 20(15S), 85-95
Triple Superphosphate, 44-46, 85-95
Monoammonium Phosphate, 52 (11N), 95-100
Ammonium Phosphate, 20(16N-15S), 95-100
Diammonium Phosphate, 46(18N), 95-100
Ammonium Polyphosphate, 34(10N), 100
Ok, this time the ‘best’ AVAILABLE source of pure Phosphorous is somewhat ambiguous (some P salts have nitrogen in them, especially the ammoniates). It will most definitely be one of the Apatite phosphorous concentrates that are dissolved in sulfuric acid to make phosphoric acid, superphosphate (16 - 21% P2O5) and triple superphosphate (43-48% P2O 5) for raw fertilizer salts.
Triple SuperPhosphate that has been ground with a coffee grinder to a powder is the easiest to find and use. First I cheleat this for about a week, then I shake and let stand for months in a light and air-tight container as I use it.
Phosphoric Acid is also great stuff, especially Superphosphoric Acid … but you will definitely have to adjust the Ph if you use this. I use it in conjunction with Hydrated Lime as they are opposites on the Ph scale. The actual mixture is more of an art form than science.
We’ll talk about Ph of the salts in another post.
Last edited by Delta; 12-06-2001 at 11:22 AM..
|