Phosphoric Acid 75% USP Food Grade for Agriculture

Soil pH Adjustment

Alkaline soils limit nutrient availability to crops. Phosphoric acid is applied to lower soil pH into optimal ranges, improving the uptake of phosphorus, iron, zinc, and manganese. Unlike sulfuric acid, phosphoric acid contributes usable phosphorus to the soil profile while adjusting pH.

Fertigation and Nutrient Delivery

Phosphoric acid is injected into drip and sprinkler irrigation systems to deliver phosphorus directly to the root zone. Its liquid form makes it compatible with most fertigation equipment, and the 75% concentration allows precise dosing at low injection rates.

Irrigation System Maintenance

Mineral scale — primarily calcium carbonate — builds up inside drip emitters, spray nozzles, and supply lines over time, reducing flow uniformity. Periodic flushing with diluted phosphoric acid dissolves these deposits and restores system performance without damaging polyethylene or PVC components.

Hydroponic and Greenhouse Nutrient Solutions

Controlled-environment growers use phosphoric acid to formulate nutrient solutions and to lower pH in recirculating hydroponic systems. Its contribution of plant-available phosphorus makes it a dual-purpose pH adjuster in these settings.

Foliar Phosphorus Supplementation

Dilute phosphoric acid solutions can be applied as foliar sprays during critical growth stages when root uptake alone may not meet crop phosphorus demand — particularly during flowering and fruit set.

Phosphoric acid at 75% concentration is corrosive. Agriculture personnel should follow these protocols:

• Read the SDS thoroughly before first use and ensure it is accessible at every point of application
• PPE requirements: Chemical-resistant gloves, splash-proof safety goggles, and protective apron at minimum. Use respiratory protection if misting or vapor is generated during mixing
• Storage: Keep drums in a cool, dry, well-ventilated area away from incompatible materials (strong bases, metals, oxidizers). Store on secondary containment to capture potential spills
• Container integrity: Keep drums sealed when not in use. Phosphoric acid is hygroscopic and will absorb moisture from the air, potentially diluting the concentration over time
• Spill response: Neutralize small spills with soda ash or lime. Contain and prevent runoff into waterways. Refer to the SDS for detailed spill procedures
• Regulatory compliance: Follow all applicable federal, state, and local regulations governing chemical storage and application in agricultural settings

Alliance Chemical serves agriculture customers across the United States with:

• Bulk pricing on multi-drum and tote orders — contact us for volume quotes
• Fast shipping from strategically located distribution centers
• Dedicated support for technical questions, concentration guidance, and application rates
• COA and SDS provided with every shipment — available on request before purchase as well

• Certificate of Analysis (COA): Provided per lot, confirming concentration, specific gravity, and impurity levels
• Safety Data Sheet (SDS): Included with every order and available for download prior to purchase

Need phosphoric acid for your agriculture operation? Whether you are managing soil pH across row crops, maintaining a drip irrigation system, or formulating hydroponic nutrient solutions, Alliance Chemical can supply the volume and grade your program requires.

Reach out for pricing, bulk order quotes, or technical guidance on concentration and application rates.