Acid sulphate soils in Indonesia's tidal swamps and Thailand's coastal plains cause a problem that ordinary organic matter does not fix quickly. When the pyrite layer oxidises, pH can drop below 4, aluminium becomes soluble, and young roots stop growing. Sodium humate at pH 9-11 attacks that condition from two directions: it neutralises free acidity and it binds the soluble aluminium and iron that would otherwise damage the root tip.
This granule is made for that job. We keep the pH in the 9-11 band and the humic acid above 60%, then screen to 1.5-2.5 mm so the material can be applied by hand or spreader on ground that is often too wet for machinery. On tidal land the usual practice is to apply after drainage and before the next flooding cycle, so the granules have a window to react with the oxidised layer.
A word of caution we give every buyer: sodium humate is an amendment, not a lime substitute. On very severe acid sulphate soil, pH below 3.5, it should be used alongside lime or dolomite rather than alone, and the rate should follow a soil test. We would rather sell you the right programme than a larger tonnage.
Key Features
- pH 9-11 working range: neutralises free acidity in the oxidised horizon and lifts pH into a range where roots can function.
- Aluminium detoxification: the humate fraction chelates soluble Al and Fe, reducing root tip damage on freshly drained acid sulphate soil.
- Aggregate rebuilding: improves structure in heavy clay tidal soils, which improves drainage and reduces the next season's waterlogging.
- Spreader and hand friendly: 1.5-2.5 mm granules work on soft ground where a spinner would sink, without the dust of powder.
- Pairing guidance included: we supply a programme sheet covering combination with lime or dolomite and the soil test values to watch.
- Consistent alkalinity: pH checked per batch, so the neutralising effect does not swing between deliveries.
Technical Specifications
| Parameter | Specification |
|---|
| Product name | Sodium Humate Granules, alkaline soil amendment grade |
| CAS number | 68131-04-4 |
| HS code | 38249999 |
| Total humic acid (dry basis) | ≥60% |
| Total organic matter (dry basis) | ≥75% |
| Water solubility | ≥95% |
| pH (1% solution) | 9-11 |
| Moisture | ≤15% |
| Granule size | 1.5-2.5 mm |
| Sodium content | 9-11% as Na2O |
| Standard | HG/T 3278-2018 Type II |
Applications and Dosage Guidance
On tidal acid sulphate land, apply 500-1,000 kg per hectare after the field has been drained and the pyrite layer has oxidised, incorporate to 10-15 cm, and then flood and drain twice before planting. On lighter acidity, pH 4.5-5.5, a rate of 300-500 kg per hectare with 1-2 tonnes of lime or dolomite is usually enough to bring the plough layer into a workable range. Always confirm with a soil test, because applying alkaline sodium material to already neutral soil creates a different set of problems.
On established plantations with acidic soil, 300-500 g per tree per round at the drip line, once or twice a year, is a safer route than a heavy single application. For vegetable beds on acid sandy soil, 150-250 kg per hectare incorporated before planting, combined with compost, gives a more stable pH through the crop than humate alone.
Packaging, Documentation and Quality Assurance
Packing is 25 kg PP woven bags with PE liner, 40 bags per pallet, or 1,000 kg jumbo bags. For tidal areas where bags are carried by boat to the field, we can supply 20 kg bags on request to keep the unit weight manageable. Bag printing in Bahasa Indonesia is available from 500 bags.
Documents include COA with pH and sodium content, MSDS, packing list and certificate of origin. Because pH is the critical parameter for this application, we report the actual measured value per lot rather than only a range. Our technical team can review your soil analysis and suggest a rate before you order, and factory audits are welcome under ISO 9001:2015.
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