Solutions
Fully Water-Soluble Fertilizers for Drip and Fertigation Systems
A fertilizer for fertigation is judged by what it does not leave behind. In a drip system the nutrient solution passes through filters, valves and emitters that cannot be cleaned once they are buried, so the figures that matter are water-insoluble matter, pH of the working solution and how completely the product goes into solution at field dilution — not the headline nutrient ratio alone.
Our macro-element water-soluble fertilizer is produced to NY/T 1107-2020 in two confirmed grades: 19-19-19 + 2MgO + TE at total nutrients 57% minimum, and 20-20-20 + 2MgO + TE at 60% minimum, both with water-insoluble matter at 1% maximum and a working pH range of 3.0 to 9.0 at 250-times dilution. Those are the numbers a system designer can work with, and they are stated on the technical data sheet rather than left to the trade name.
This page is written for the people who specify irrigation: plantation and estate engineers, protected-culture operations, and the distributors who supply them. It covers what the grades are, how they behave in a system, and what to confirm before the first tank is filled.
The problem
What this page is here to solve
Emitters that clog in the first season
A grade can be called water-soluble and still leave residue at field dilution. Water-insoluble matter, the form of the phosphate and the dilution you actually run at decide whether sediment forms in the line. We quote the water-insoluble figure and the pH range with the grade, so the specification is on the table before the system is installed rather than after the first blockage.
Nutrient ratios that do not match the growth stage
A single ratio carried through a whole cycle usually over-supplies one element and under-supplies another. The two confirmed grades let a programme move between a balanced analysis and a higher-nutrient analysis without changing the handling, packing or dissolution behaviour — the system stays the same while the programme changes.
Trace-element packages that are not stated
A crop programme needs to know what is in the trace-element package, not that there is one. Our grades carry magnesium as MgO and a stated trace-element package, so the secondary and micronutrient contribution is written down and can be balanced against the rest of the programme.
Mixing problems in the tank
Incompatibility between a fertilizer and a crop-protection product, or between two fertilizers, shows up as precipitate in the tank. The working pH range is the first thing to check, and the technical data sheet states it. We also tell you plainly that compatibility testing for your specific tank mix is work for you and your agronomist, not a claim we can make at a distance.
Recommended configuration
Recommended configuration for a fertigation programme
The two confirmed water-soluble grades cover most fertigation programmes; magnesium sulfate is added where the water or the programme needs a magnesium source.
| Input | Confirmed grade & figures | Where it fits |
|---|---|---|
| Macro-element water-soluble fertilizer | 19-19-19 + 2MgO + TE · total nutrients ≥ 57% · moisture ≤ 3.0% · water-insoluble matter ≤ 1% · pH 3.0–9.0 at 250× dilution · NY/T 1107-2020 | Balanced grade for continuous fertigation and for blended programmes |
| Macro-element water-soluble fertilizer | 20-20-20 + 2MgO + TE · total nutrients ≥ 60% | Higher-nutrient grade in the same systems, where a stronger analysis is wanted |
| Anhydrous magnesium sulfate | MgSO4 ≥ 98% · water-insoluble matter ≤ 0.10% · chloride ≤ 0.2% | Magnesium and sulfur source to add where the programme or the irrigation water calls for it |
| Packing for system use | 25 kg or 50 kg PP woven bags with PE liner · 1000 kg FIBC with PE liner | Bags suit stock-and-mix operations; FIBC suits central mixing and large 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
Fertigation buyers compare figures, not adjectives. These are the things we put in writing for an irrigation customer.
- Water-insoluble matter, moisture, biuret and working pH stated with every water-soluble grade
- Two confirmed grades that share the same handling, so a programme change does not change the system
- Magnesium content declared as MgO, with the trace-element package stated rather than implied
- Technical data sheet available before the first order, so the figures can be checked against your system
- Packing chosen for the mixing point: bags for stock-and-mix, jumbo bags for central mixing
- We say what we cannot answer: tank-mix compatibility for your specific products is for you and your agronomist
FAQ
Questions buyers ask about this
- What makes a fertilizer suitable for drip irrigation?
- Complete solubility at the dilution you actually run, a stated water-insoluble figure, and a working pH range you can check against the rest of the programme. The confirmed water-soluble grades here state water-insoluble matter at 1% maximum and a pH of 3.0 to 9.0 at 250-times dilution, which is the kind of figure a system designer can work with.
- Which grades do you supply for fertigation?
- Two confirmed macro-element water-soluble grades: 19-19-19 + 2MgO + TE with total nutrients at 57% minimum, and 20-20-20 + 2MgO + TE with total nutrients at 60% minimum, both produced to NY/T 1107-2020. Anhydrous magnesium sulfate at 98% minimum MgSO4 is supplied where the programme needs a magnesium source.
- Can I mix these with crop-protection products in the tank?
- That depends on the specific products and the water, and it is not something we can confirm at a distance. The working pH range of the fertilizer is the first thing to check, and the technical data sheet states it. The compatibility test itself is work for you and your agronomist, or for the manufacturer of the other product.
- Do you publish application rates for drip systems?
- No. Rates depend on the crop, the soil, the irrigation water, the growth stage and the rest of the programme, and a rate written on a supplier's website is not a recommendation for your field. We state what the product contains, and the programme itself belongs with your agronomist or extension service.
- What packing suits a fertigation operation?
- Operations that mix in a stock tank usually take 25 kg or 50 kg bags with a PE liner; central mixing stations and large blocks usually take 1000 kg jumbo bags. Loading quantities differ between the two, and we issue the loading plan per packing configuration before booking.
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.
Application
Water-Soluble Grades for Foliar Feeding Programmes
Water-soluble grades for spray programmes, quoted with the solubility, pH and impurity figures a foliar mix 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.
For importers & distributors
Water-Soluble & Compound Fertilizer for Importers and Distributors
Bulk water-soluble and compound fertilizer, quoted against your written specification and shipped with a batch certificate of analysis.
Check a grade against your system
Tell us the system, the water and the programme you run. We will send the technical data sheet with the solubility and pH figures so you can check them before ordering.