Water Soluble Sodium Humate Granules 0.5-1.5mm for Drip Fertigation Systems

Fully water-soluble sodium humate granules are the grade that survives a fertigation line without blocking drippers or nozzles. This 0.5-1.5 mm product dissolves to better than 99% in cold water within a few minutes of agitation, leaving less than one percent insoluble residue, which is the number that decides whether a 200-mesh filter stays clean through a spraying shift.

Vietnamese and Thai vegetable growers typically use it two ways: dissolved in a knapsack or boom sprayer at 0.05-0.1% for foliar work, or injected through drip tape at 3-5 kg per 1,000 litres during the vegetative stage. Both routes punish poor solubility. A granule that leaves residue will coat the filter screen and, within a week, cut emitter flow by a third, which is why we screen and test solubility on every lot rather than sampling at random.

The granules are made from the same weathered coal base as our soil grade, but the reaction liquor is settled longer and the drying is slower, which raises the soluble fraction and reduces the fines that cause tank sediment. If your irrigation water is hard, add the granules after the calcium and magnesium are already in the tank, not before.

• 99% cold water solubility: dissolves in minutes with normal agitation, leaving minimal residue for filters to catch.
• Drip and sprinkler safe: designed for fertigation lines with 120-200 mesh filtration, no nozzle scoring in normal use.
• Low fines content: screened granules produce little tank sediment, so the mixing tank needs less cleaning between batches.
• Foliar grade purity: at 0.05-0.1% dilution it sprays clean without leaving visible film on the leaf surface.
• Compatible with common inputs: works alongside urea, potassium sulphate and most soluble trace element packs when added in the right order.
• Batch solubility test: every lot is dissolved and filtered in our lab, and the residue figure goes onto the certificate of analysis.

For foliar application, prepare a 0.05-0.1% solution, which is 50-100 g per 100 litres, and spray two to three times between flowering and early fruit fill, covering both leaf surfaces. Spray in the early morning or late afternoon; at midday the droplet evaporates before absorption and the salt load on the leaf rises. Do not exceed 0.1% on young leafy vegetables, and never tank mix with strongly acidic products in the same spray.

For drip injection, dissolve 3-5 kg per 1,000 litres in a agitated tank, let it stand for ten minutes, then inject through the main line at the end of the nutrient programme. Flush the lines with clean water for fifteen minutes afterwards. On sandy coastal soils in central Vietnam, growers report better root recovery on chilli and cucumber when the humate is applied every 10-14 days during the vegetative stage rather than as a single large dose.

Packing is 25 kg PP woven bags with PE liner, or 20 kg bags for markets that prefer smaller units, on 1 tonne pallets and shrink wrapped. For fertigation users who mix in bulk tanks we also supply 1,000 kg jumbo bags. Bags can be printed with mixing instructions and a dilution table in English, Vietnamese or Bahasa Indonesia.

Each lot ships with a COA showing humic acid, solubility, insoluble residue, moisture and pH, plus an English MSDS. Retained samples are held for twelve months so an incoming claim can be checked against the production lot. Our line is audited to ISO 9001:2015, and we can arrange third-party inspection or a pre-shipment solubility demonstration at the factory for new buyers.