Sandy coastal soils along central Vietnam and the Philippines' Ilocos coast have two problems in common: they hold almost no organic carbon, and water moves through them fast enough that anything soluble is gone within a week. A slow release granule addresses both, but only if it stays in the root zone long enough to do any work. That is what this 1.5-2.5 mm grade is built for.
The granule is denser and slower wetting than our standard cut, and it breaks down across two to three irrigation or rainfall cycles. Placed in a band 10-15 cm below the transplant row, it sits below the evaporation zone and above the leaching front, which is where root density is highest in the first month after transplanting. Growers using this method on chilli, tomato and watermelon report better root ball development and less transplant shock in the first two weeks.
We usually recommend pairing it with compost or a cover crop rather than using it alone. Humate improves the soil's ability to hold what is applied, but it cannot rebuild organic carbon in a coastal sand by itself, and buyers who expect that from a single application tend to be disappointed.
Key Features
- Slow release in coarse sand: denser granule breaks down over two to three wetting cycles instead of leaching through in one irrigation.
- Band placement design: sized for placement 10-15 cm below the transplant row, in the zone where young roots actually form.
- Reduced transplant shock: growers report better root ball development in the first two weeks after transplanting on chilli and tomato.
- Water and nutrient retention: humate improves the cation exchange capacity of a sand that otherwise holds almost nothing.
- Works with compost: formulated for use alongside compost or a cover crop, not as a replacement for organic carbon building.
- Firm granule, low dust: handles well on windy coastal ground where powder application is impractical.
Technical Specifications
| Parameter | Specification |
|---|
| Product name | Sodium Humate Granules, coastal sandy soil grade |
| CAS number | 68131-04-4 |
| HS code | 38249999 |
| Total humic acid (dry basis) | ≥60% |
| Total organic matter (dry basis) | ≥75% |
| Water solubility | ≥80% |
| pH (1% solution) | 9-11 |
| Moisture | ≤15% |
| Granule size | 1.5-2.5 mm, densified |
| Release pattern | Two to three wetting cycles |
| Standard | HG/T 3278-2018 Type III |
Applications and Dosage Guidance
Vegetables on coastal sand: open a band 10-15 cm below the transplant row at 250-400 kg per hectare and cover with soil before setting plants, or apply 30-50 g per planting hole mixed into the backfill. Irrigate immediately after transplanting to settle the soil around the root ball. For watermelon and melon, a slightly higher rate of 400-500 kg per hectare is common where the sand fraction exceeds 85%.
On cashew and coconut along the coastal belt, 300-500 g per tree per year in a ring at the drip line, covered with pruned material, reduces the frequency of decline symptoms in dry spells. Where drip irrigation is installed, dissolve the finer cut at 3-5 kg per 1,000 litres and inject monthly during the establishment year, then switch to the granular band application from year two.
Packaging, Documentation and Quality Assurance
Packing is 25 kg PP woven bags with PE liner, 40 bags per 1 tonne pallet, or 1,000 kg jumbo bags. For coastal areas where bags are moved by hand or by boat, 20 kg bags are available on request. Bags print your importer brand and an application diagram for band placement from 500 bags.
Each shipment includes COA, MSDS, packing list and a one-page application card with the band placement diagram, which dealers can hand to growers. Retained samples are kept for twelve months, and our technical team can review soil test results to suggest a rate before the first order. Third-party inspection and factory audits are welcome.
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