Plant Uptake of the Phosphate
Plants absorb P as Orthophosphate ions H2P04- and HP042- Polyphosphates are a chain link molecule of orthos and are not available to the plant until conversion.
Source: Farm Facts –Phosphorous fertilization in crop production and TVA.
Super Phosphoric Acid (SPA) combined with NH3
Processed through a Pipe Reactor = 10-34-0 or 11-37-0
- Chain Link Molecule of Orthophosphate
- Unavailable to the plant in that form
- Must convert to orthophosphate
- Time and Temperature
White and Green Orthophosphate acid, KOH, Aqua Ammonia, APP and water
- Chemically combined to form MKP, DKP, MAP and DAP
- Hot mix reaction – Chemically combining the raw materials
- MKP – very soluble and highly available
- Neutralized to virtually non corrosive state.
|(11.7 lbs/gal) x (0.34) = 3.978 lbs P2O5/gallon
times 5 gal/A
Equals 19.89 lbs P2O5/A
|(12.82 lbs/gal) x (0.22) = 2.82 lbs P2O5/gallon
times 4 gal/A
Equals 11.3 lbs P2O5/A
5.97 lbs/A in the Ortho-phosphate form
7.9 lbs/A in the Ortho-phosphate form
13.92 lbs/A in the Poly-phosphate form
3.4 lbs/A in the Poly-phosphate form
|Even after 30 days, with a soil pH of 7.2, 50% of the phosphate will still
be in the Poly-Phosphate form, being unavailable for the crop to utilize.
- high impurities
- high viscosity, hard meter evenly
|- includes Micro package
- no urea
- low salt index, guaranteed seed safe
- low impurity level
- product storability
- low viscosity
The form of Phosphorus taken up by the plant
|Higher levels of impurities
Not immediately available
Must convert in soil to the Orthophosphate before the plant can use it
Good carrier for micronutrients
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