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Triple Super Phosphate
At www.litemanu.com, they sell Mono Potassium Phosphate (KH2PO4?) and
something called "triple super phosphate". I googled triple super phosphate
and found this information:
"The other common phosphorus fertilizer is triple superphosphate (TSP),
0-45-0. The formula is Ca(H2PO4)2 . The P is in the orthophosphate form. Its
The P2O5 concentration of the pure compound is 60%. Phosphoric acid is added
to rock phosphate to produce TSP. The impurities in the rock phosphate
reduces the P2O5 to about 45% P2O5 . There is about 2% S in the fertilizer
The Mono Potassium Phosphate is $4.20/lb, but the triple super phosphate is
only $1.49/lb. So:
1. Would the TSP give more P per tsp?
2. Would the Ca in the TSP change my GH?
-Rachel, wondering why she cares about saving under $3.00 in what will
probably be a lifetime supply of phosphate.
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