Robusta Coffee Replant Root Drench Liquid Humic Acid 12% Concentrated Biostimulant Vietnam Farms

Replanting old robusta is where most Vietnamese cooperatives lose two years of income. The stumps come out, the soil is compacted by the excavator, the new seedlings go in, and then the dry season arrives with a root system that has not yet reached the subsoil moisture. The plant survives but stalls, and the farmer compensates with extra urea, which pushes leaf growth and makes the stall worse. A 12% liquid humic acid applied as a root drench at planting and twice after is the cheapest intervention we know for that specific window.

This is a concentrated alkaline liquid, 12% humic acid plus 3% fulvic acid, made by alkaline extraction of oxidised leonardite and then filtered to below 0.5% insolubles so it passes a drip emitter and a knapsack nozzle without clogging. In the nursery it is used at 1:400; in the field at 1:200 around the drip line of a young tree, half a litre to one litre of diluted solution per plant. The fulvic fraction moves into the root zone quickly, the humic fraction stays in the top 20cm and holds exchange sites for the calcium and magnesium the new tree needs.

We are blunt about the limit: on a badly compacted replant block, no liquid will fix hardpan. What the drench does is buy time until the roots find their own water, and reduce the seedling loss rate that usually runs 5-10% in the first dry season. Farms that use it typically report that they stop replacing dead seedlings after the second month, which is worth far more than the product cost per hectare.

• Filtration below 0.5% insolubles: Passes drip lines and knapsack nozzles without screen cleaning, tested on 120 mesh filters
• Fulvic plus humic in one drum: Fast-moving fulvic fraction for immediate root contact, humic fraction for exchange capacity in the topsoil
• Replant shock management: Applied at planting and 30 days later, reduces first-dry-season seedling mortality on compacted blocks
• Compatible with fertigation: Dilutes cleanly at 1:200 in hard water up to 400 ppm CaCO3 without precipitation
• No chloride load: Chloride below 0.3%, safe for repeated use around young coffee roots
• Drum to field traceability: Batch number on each drum, retained sample kept 24 months, COA issued per lot

Use at 1:200 to 1:400 dilution. Nursery: 200-300 ml per seedling tray pass, every 15 days. New planting: 0.5-1 L of diluted solution per tree at planting, then at 30 and 90 days. Bearing trees: 2-3 L of diluted solution per tree at the start of the wet season, injected through the drip line or poured in the drip circle. For pepper intercropped with coffee, the same dilution works at 0.3 L per vine.

Do not tank-mix with acidic calcium fertilisers or with copper-based fungicides in the same pass; the alkaline liquid will flocculate them. Flush the drip line with clean water for ten minutes after injection, and never leave the concentrate in an unlined steel drum for more than a month.

Packed in 20L jerry cans, 200L steel drums and 1000L IBC totes with a top-fill valve. Drums are lined and the closure is tamper evident. For distributors we supply neutral labels or your own artwork, including your dilution table printed on the back panel in Vietnamese, Bahasa or English.

Each batch is analysed for humic acid, fulvic acid, density, pH and insolubles, and the analysis sheet travels with the drum. We keep a one-litre retained sample per batch for 24 months and can arrange third-party verification at Qingdao before loading. If a farm reports separation or sediment on arrival, send us a photo of the drum seal and the batch code and we will pull the retained sample and respond within three working days.