Cold water solubility is the specification that matters in the Gulf. Groundwater in Saudi Arabia and the Emirates often arrives at the farm at 30 C or higher and with a hardness that makes some humate products gel in the tank before they ever reach the dripper. This grade is formulated to dissolve in unheated water within a few minutes of normal agitation, at hardness levels up to 400 mg per litre as calcium carbonate.
Center pivot growers use it as a seasonal soil application rather than a weekly tonic: 10-15 kg per hectare injected through the pivot at the start of the season and again at mid-cycle, which is enough to keep the humate fraction in the root zone without coating the sprinkler packages. Drip growers on date palm and greenhouse vegetables usually run 3-5 kg per 1,000 litres every 10-14 days during the vegetative stage.
Because the water is often warm and the tanks are in direct sun, we recommend mixing in the evening and using the solution within 24 hours. Our technical sheet covers the order of addition when the programme also includes calcium nitrate and potassium sulphate, which is where most tank incompatibility problems start.
Key Features
- Cold water soluble: dissolves in unheated water within minutes, without the gel formation some humates show in hard groundwater.
- Hard water tolerance: tested in water up to 400 mg per litre hardness as calcium carbonate.
- Pivot and drip compatible: low insoluble residue keeps sprinkler packages and drip emitters flowing at design rate.
- Heat-stable packing: PE liner and heat-sealed mouth protect the granule through container temperatures above 50 C.
- Tank order guidance: written mixing sequence for calcium nitrate, potassium sulphate and trace element packs.
- Two use patterns covered: seasonal soil injection rates for pivots and fortnightly maintenance rates for drip.
Technical Specifications
| Parameter | Specification |
|---|
| Product name | Sodium Humate Granules, cold water soluble grade |
| CAS number | 68131-04-4 |
| HS code | 38249999 |
| Total humic acid (dry basis) | ≥60% |
| Water solubility at 25 C | ≥99% |
| Insoluble residue | ≤1% |
| pH (1% solution) | 9-11 |
| Moisture | ≤15% |
| Granule size | 0.5-1.5 mm |
| Hard water tolerance | Up to 400 mg/L as CaCO3 |
| Standard | HG/T 3278-2018 Type I |
Applications and Dosage Guidance
Center pivot: inject 10-15 kg per hectare at the start of the season, before the first fertigation round, and repeat at mid-cycle. Run the pivot at normal speed with clean water for ten minutes after injection to clear the line. Drip: dissolve 3-5 kg per 1,000 litres in an agitated tank, allow ten minutes settling, then inject at the end of the nutrient programme and flush for fifteen minutes.
For date palm, 150-250 g per tree per month through the drip line during the growing season, with a pause in the hottest six weeks if the soil sodium level is already high. For greenhouse cucumber and tomato on sand, 2-4 kg per 1,000 litres every 10-14 days from transplant to first harvest, reduced by half once the crop is in full fruit load and root turnover slows.
Packaging, Documentation and Quality Assurance
Packing is 25 kg PP woven bags with a heat-sealed PE liner, chosen because it survives the container temperatures common on Gulf routes, on 1 tonne pallets. Bags can be printed in English and Arabic from 500 pieces. A 20GP carries 25 tonnes palletised.
Each lot ships with COA reporting solubility and insoluble residue at 25 C, MSDS in English, and a mixing sequence card for the tank. Retained samples are kept for twelve months. If a shipment is held at the port for laboratory testing, we can supply the analytical method and reference standard used, which usually shortens the clearance process.
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