Phosphite Nutrition — Process Challenge

Potassium Phosphite & Phosphorous Acid for Phosphite Nutrition

Specialty ag, turf and greenhouse buyers source phosphorous acid and potassium phosphite as phosphite (PO3) nutritional inputs, bought in drums and totes. Phosphite is a distinct, highly mobile reduced-phosphorus ion that moves both up and down in the phloem. (Position strictly as plant nutrition; any disease-control claim triggers pesticide registration and must clear legal-review.)
Updated Jun 2026
Solution Approach

RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.

Typical Application Workflow
1
Application & Agronomic Review
Define the use (crop input, adjuvant, soil amendment, post-harvest) and the agronomic, regulatory, and tank-mix requirements.
2
Input & Grade Selection
Match the surfactant or adjuvant, nutrient source, chelate, or formulation aid to the active, water quality, and label.
3
Compatibility & Rate Trial
Confirm tank-mix compatibility, dose, and stability, and size packaging (jugs, drums, totes, bulk) to the season and logistics.
4
Field Validation
Validate efficacy and crop safety in field trials, and lock the spec and supply plan for the season.
Recommended Chemistries (4)
Phosphorous acid (H3PO3)
CAS 13598-36-2
Diprotic acid that dissociates to phosphite (HPO3/PO3) ions, the mobile reduced-P species supplied in phosphite nutrition programs
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Mono/di-potassium phosphite
CAS 13977-65-6
Neutralized potassium salt of phosphorous acid giving systemic, pH-buffered phosphite plus K in a tank-friendly form
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Mono/di-ammonium phosphite
Ammonium phosphite salt supplying phosphite plus N for foliar and fertigation blends
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Phosphoric acid
CAS 7664-38-2
Acids & Salts
pH adjuster
1805 (Phosphoric acid, solution) · Class
Fully oxidized orthophosphate (PO4) acid that contrast product, it is the conventional non-phosphite P and a fertigation pH-down acid
Melting Point: 42 °C   Boiling Point: > 130 °C at 760 mmHg   Density: 1.892 at 25 °C
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Need help selecting the right chemistry?

Our team can help with grade selection, dosage guidance, and multi-origin sourcing.

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