humic acid granular fertilizer Manufacturers

When sourcing humic acid granules, you must prioritize the Humic Acid Content (typically 50%-70%) and the Fulvic Acid percentage, as these determine biological activity. Pay close attention to Water Solubility; for soil application, a lower solubility is acceptable, but for irrigation systems, you need 100% water-soluble granules. Additionally, verify the Particle Size (2-4mm is standard) and Hardness to ensure the granules do not crush during mechanical spreading or long-term storage.

To ensure market access and quality, look for suppliers with ISO 9001 for quality management and ISO 14001 for environmental standards. For the organic market, certifications like OMRI (USA), ECOCERT (EU), or REACH compliance are critical. Always request a Certificate of Analysis (COA) and a Material Safety Data Sheet (MSDS) to verify heavy metal limits (such as Lead, Arsenic, and Cadmium) meet the destination country's agricultural regulations.

Request a small sample (1-5kg) to conduct a dissolution test and check for residue. Evaluate the moisture content (should be <15%) to prevent clumping. For long-term soil health, inquire about the Cation Exchange Capacity (CEC), which indicates the fertilizer's ability to hold nutrients. Professional buyers often use third-party inspection services like SGS or Intertek to verify the nutrient analysis matches the supplier's claims before the balance payment is made.

Humic acid granules are primarily used for Soil Conditioning to improve structure and water retention. They are ideal for Large-scale Agriculture (corn, wheat, rice), Horticulture, and Turf Management. The key benefit is Nutrient Synergy, where the humic acid acts as a natural chelator, increasing the uptake of NPK fertilizers by up to 20-30%, thereby reducing overall input costs for the end-user.

Utilize Secure Payment services provided by reputable platforms like Made-in-China.com, which offer escrow-style protection. Never wire full payments to private bank accounts. Use Letter of Credit (L/C) for very large volumes or Trade Assurance to ensure the supplier adheres to the agreed-upon shipping dates and quality specifications.

Focus on Volume-Based Pricing; prices for humic acid are highly sensitive to raw material (leonardite) costs. Negotiate for Custom Packaging (OEM), such as 25kg or 1000kg jumbo bags with your branding. Ask for Tiered Discounts—for example, a 5-10% price reduction when moving from a 20ft container to a 40ft container. Establish a Long-term Partnership Agreement to lock in prices against seasonal market fluctuations.

Fertilizers are sensitive to moisture. Ensure the contract specifies Palletized Shipping with Shrink-wrap and the use of Desiccants inside the container. Verify the Incoterms (FOB or CIF); for fertilizers, FOB is often preferred by experienced buyers to maintain control over ocean freight costs. Ensure the bill of lading clearly states the product is 'Non-Hazardous' to avoid unnecessary customs delays or surcharges.

Check the HS Code (usually 310100 or 382499) to determine import duties in your country. Some regions have Anti-dumping duties on specific chemical products. Ensure the supplier provides a Phytosanitary Certificate if required by your local Ministry of Agriculture, and confirm that the packaging materials (like wooden pallets) comply with ISPM 15 heat-treatment standards.