Solutions
Water-Soluble and Magnesium Sulphate for Vineyards
A foliar fertilizer for grapes is bought for what happens on the leaf, and the leaf is unforgiving. A product that does not dissolve completely leaves residue at the nozzle; a mix that carries an unstated salt load can scorch the canopy it was meant to help. That is why a vineyard page starts with solubility, pH and the impurity figures rather than with a formula.
Our macro-element water-soluble fertilizer is produced to NY/T 1107-2020 in two confirmed grades — 19-19-19 + 2MgO + TE at 57% minimum total nutrients and 20-20-20 + 2MgO + TE at 60% minimum — with water-insoluble matter at 1% maximum, moisture at 3.0% maximum, biuret at 0.9% maximum and a working pH of 3.0 to 9.0 at 250-times dilution. Anhydrous magnesium sulfate at 98% minimum MgSO4, with chloride at 0.2% maximum, is supplied where a magnesium input is part of the programme.
This page is written for vineyard owners, estate technical managers and the distributors who supply them. It sets out the grades and the figures behind them, and it deliberately publishes no spray rate and no timing: those belong with your agronomist and your own block records.
The problem
What this page is here to solve
Scorch after a spray
Leaf burn usually traces back to concentration, tank-mix order or the salt load in the product rather than to the nutrient ratio. Working pH and the impurity figures decide how aggressive a mix is, and both are stated with our grades on the technical data sheet.
Residue that blocks nozzles and filters
Undissolved material costs a spray twice: once in the blocked nozzle and again in the row that gets no coverage. Complete dissolution at the dilution you actually run is the requirement, and a stated water-insoluble figure is how a buyer checks it before the season rather than during it.
Magnesium that arrives with chloride
Where a vineyard wants magnesium but not extra chloride, the source decides whether the programme stays where it was planned. Anhydrous magnesium sulfate states both figures — MgSO4 at 98% minimum and chloride at 0.2% maximum — so a magnesium correction can be planned deliberately.
Grades that behave differently batch to batch
A vineyard sprays many times a season, and each repetition multiplies small differences. What a buyer needs is a grade whose figures do not move: the same dissolution behaviour, the same pH range, the same reading on the certificate of analysis, shipment after shipment.
Recommended configuration
Confirmed grades behind a vineyard programme
The table shows the confirmed lines this page is built on; anything outside it we will flag before you plan around it.
| Product | Confirmed grade & figures | Where it fits |
|---|---|---|
| Macro-element water-soluble fertilizer | 19-19-19 + 2MgO + TE · total nutrients ≥ 57% · water-insoluble matter ≤ 1% · biuret ≤ 0.9% · pH 3.0–9.0 at 250× dilution · NY/T 1107-2020 | Balanced grade for a repeated spray or fertigation programme |
| Macro-element water-soluble fertilizer | 20-20-20 + 2MgO + TE · total nutrients ≥ 60% | Higher-nutrient grade in the same handling |
| Anhydrous magnesium sulfate | MgSO4 ≥ 98% · chloride ≤ 0.2% · water-insoluble matter ≤ 0.10% | Magnesium input where the programme or the leaf analysis calls for one |
| Packing | 25 kg or 50 kg PP woven bags with PE liner · 1000 kg FIBC with PE liner | Bags for field mixing; jumbo bags for central mixing and larger blocks |
Specifications shown are indicative; the controlling values are those in the technical data sheet (TDS) and the batch certificate of analysis issued for your order.
Why work with us
Written into the quotation, not into an advert
A spray programme is only as repeatable as the grade behind it; these are the points we put in writing.
- Solubility, water-insoluble matter, moisture, biuret and working pH stated with the grade
- Batch certificate of analysis with every shipment, so figures can be checked batch by batch
- A magnesium option with chloride stated at 0.2% maximum, for a chloride-free programme
- Technical data sheet available before the order, for the agronomist as well as the buyer
- Two confirmed grades in the same handling, so a programme change does not change the mixing
- We do not publish spray rates or timing; the programme belongs with your agronomist
FAQ
Questions buyers ask about this
- Which grades do you supply for vineyard programmes?
- Macro-element water-soluble fertilizer at 19-19-19 + 2MgO + TE (total nutrients ≥ 57%) and 20-20-20 + 2MgO + TE (≥ 60%), both to NY/T 1107-2020, plus anhydrous magnesium sulfate at 98% minimum MgSO4 with chloride at 0.2% maximum.
- What should I check before choosing a foliar grade?
- Solubility at the dilution you use, water-insoluble matter, working pH and the impurity figures such as biuret, because those decide how the mix behaves on the leaf. The confirmed grades here state water-insoluble matter at 1% maximum, biuret at 0.9% maximum and a working pH of 3.0 to 9.0 at 250-times dilution.
- Can these be tank-mixed with other products?
- That depends on the specific products, the water and the order of mixing, and it is not something we can confirm at a distance. Checking the working pH of the fertilizer against the other product is the first step, and compatibility testing is work for you and your agronomist.
- Do you publish spray rates or timing?
- No. Rates and timing depend on the variety, the growth stage, the tank mix and local conditions, and a number published by a supplier is not a recommendation for your block. We state what the product contains and how it behaves in solution.
- What packing suits a vineyard?
- 25 kg or 50 kg PP woven bags with a PE liner for field mixing, and 1000 kg jumbo bags with a PE liner for central mixing and larger areas. Loading quantities differ, which the loading plan states for your configuration.
Related
Specifications, documents and buying notes
Macro-Element Water-Soluble Fertilizer
Water-soluble NPK grades 19-19-19 and 20-20-20 + 2MgO + TE for fertigation and foliar feeding.
Anhydrous Magnesium Sulfate
Anhydrous MgSO₄ ≥98% — magnesium raw material for fertilizer, desiccant and industrial use.
How to Compare Magnesium Sulfate Quotations — Hydration Form and Purity Basis
Three magnesium sulfate quotations that look comparable often are not. The hydration form and the purity basis decide how much magnesium you actually receive per tonne.
Related applications
Other application pages on the same theme
Organised the way buyers ask about them — pick whichever page is closest to your situation.
Crop & agronomy
Magnesium Sulphate and NPK for Citrus Orchards
A chloride-free magnesium input and water-soluble NPK grades for citrus orchards, quoted against your specification.
Crop & agronomy
Water-Soluble NPK Programme for Tomato
Fully water-soluble NPK grades for tomato, open field and protected, quoted on the figures a programme depends on.
Protected culture
Water-Soluble Fertilizer for Greenhouse Vegetables
Fully water-soluble NPK grades for protected culture, quoted with the solubility, pH and impurity figures a house depends on.
Ask for the figures on a foliar grade
Tell us the programme and the dilution you work at; we will send the technical data sheet with the solubility, pH and impurity figures for your agronomist to check.