Field guide · Viticulture
An amendment changes what your soil stores and how far the roots reach it. It does not make rain, and it will not rescue a block whose real constraint is rootstock, canopy or a capped water allocation. Decide which of those binds before you spend on the soil.
Five different constraints produce the same tired canopy, and only two respond to anything you spread on the ground.
A small water reserve — shallow, stony or sandy, low in organic matter — keeps little of the winter rain. Water the roots cannot reach is a different fault: a compacted horizon or plough pan leaves the profile wet below where rooting stops. Heat and evaporative demand are a third: the vine closes down whatever the soil holds. Rootstock, canopy and spacing are a fourth, fixed at planting; a capped irrigation allocation is a fifth.
An amendment works on the first two, partly, and on the rest not at all. Start with a soil analysis — texture, organic matter, pH, CEC, water-holding capacity — then dig a pit or auger the inter-row to see where the roots stop.
Soil holds water in pores. Wide pores drain; narrow ones hold it too tightly for the vine. The usable reserve sits between them, so changing the pore-size distribution in the root zone is the whole mechanism.
Charged surfaces — clay and organic matter — hold nutrient cations against percolating water and release them as the soil solution is drawn down. Structure is biological too: roots and organic matter build aggregates, mycorrhizal hyphae bind particles into them (Rillig & Mummey 2006), and hyphae enter pores narrower than a root hair (Smith & Read 2008; Barea et al. 2005).
This raises the share of each rain and each irrigation the block keeps. It adds no water.
Every option below is legitimate. The question is which constraint it addresses, and at what cost.
Hydrobio by KUZOG is a hybrid mineral-biological amendment: a micronised mineral matrix carrying a living mycorrhizal consortium. Micronisation raises the specific surface area ×200, and soil chemistry happens at surfaces. Its high cation-exchange capacity holds nutrient cations against percolating water and returns them as the soil solution is depleted — retention and progressive release, not fertilisation.
The mineral is a scaffold: pore space, moisture and adsorbed nutrient through the root zone, so propagules survive long enough to meet a root. That is where a bare inoculant fails. One application lasts three to five years.
In a planted vineyard there is no soil-preparation pass, so it goes localised at the base of the vines or in the inter-row and is scratched in — light surface incorporation, not deep burial.
The figure is +47% water retention on sandy soils: controlled trials, to be confirmed in independent field trials, from South Europe and MENA conditions, not every vineyard soil. On availability: patent filed, not granted; homologation under EU Regulation 2019/1009 in preparation; first deployments underway; broader French commercialisation planned from late 2026.
Composition and dose are set per parcel by HydrobioFormul, from the parcel’s own data — not from a description of a vineyard.
Back comes a formulation sheet: composition, dose and schedule. If soil is not your binding constraint, we will say so.
A soil analysis, the block’s rootstock and age, the rainfall and irrigation context: that is enough for us to say whether soil is really your constraint. We reply within one business day.