Two fields can take the same nutrient, in the same quantity, in the same season, and get different results. Form, timing and placement decide how much of it the crop ever sees — so VAN formulates to the machine as well as to the crop.
Broadcasting a bag puts nutrient on the whole surface and hopes the root finds it. Pivot, drip and drone each place it somewhere specific — and each one narrows what the product is allowed to be.
| Pivot | Drip | Drone | |
|---|---|---|---|
| Where the nutrient lands | Whole circle, with the water | Wetted root zone only | On the leaf |
| Hardest product constraint | No precipitate in the carrier water | Near-zero insolubles — emitters and filters | Concentration and suspension stability |
| Form we supply | Soluble crystal and liquid | Liquid and soluble crystal, acidic reaction where water is hard | Concentrated liquid and fine WDG |
| What it buys the grower | Cheap splitting — many small doses | Placement — nothing applied between the rows | Access and speed — crops and windows the ground cannot reach |
| Crops it fits first | Field crops under pivot irrigation | Orchards, high-value vegetables, protected cropping | Sugarcane, maize, rice, cotton at canopy closure |
The injected solution touches every part of a long galvanised span on each pass, and the two failure directions are opposite. That is why pH is the controlled variable in a pivot programme — it decides whether the machine ages normally or early, and VAN sets it before the product is packed rather than leaving it to the grower at the injection point.
The band is a formulation specification — what these grades are built to. The measured pH comes off the certificate of analysis that ships with the batch; send the batch number and VAN sends it. No corrosion-rate or equipment-life numbers are published here — those tests have not been run, and the mechanism above is standard corrosion engineering, not a VAN measurement.
On ground above pH 8, surface-applied uncoated urea hydrolyses and escapes as ammonia; the same nitrogen behind a sulfur coating dissolves gradually instead. Chelated micronutrients stay available in alkaline soil where the sulfate equivalents precipitate out and do nothing.
Crop demand peaks at defined growth stages, and nutrient supplied outside those windows is substantially wasted. It is why the 28 crop programmes are written stage by stage rather than as a season total.
Broadcast, drilled, side-dressed, banded, fertigated or sprayed on the leaf. Each has a different loss profile — and placement is usually decided by the equipment available rather than by agronomy, which is exactly why it is worth designing for.
A product that blocks an emitter, settles out of a spray tank or is too coarse for a drone boom is not a delivery option regardless of its analysis. Solubility, particle size, pH and tank-mix behaviour decide it.
| System | What it demands of the product | Where it earns its place |
|---|---|---|
| Broadcast & side-dressing | Granular integrity, controlled dissolution, resistance to volatilisation on hot alkaline surfaces | The bulk of field-crop nitrogen and base nutrition |
| Fertigation | Full water solubility, no precipitate, no emitter blockage, compatible pH | Orchards, high-value vegetables, any drip or sprinkler system |
| Foliar | Fine particle size, tank-mix stability, leaf-safe concentration, chelated micronutrients | Correcting a deficiency inside days rather than waiting on root uptake |
| Drone / ultra-low volume | High concentration in very little water, no nozzle blockage, stable in suspension | Tall or dense standing crops a tractor cannot enter, and speed when the window is short |
| Seed & starter placement | Low salt index, safe in contact with germinating seed, early-available phosphorus | Root establishment, where a small precise quantity outperforms a large imprecise one |
VAN produces powder, granular, pellet, crystalline and liquid grades, and formulates to a customer's delivery system as part of the brief. Pack sizes are registered per product and printed on each product's own page — the only place they are kept, because a second copy is how one fact turns into two numbers.
Two programmes of our own, testing the two halves of the same idea: that form changes how much nitrogen survives, and that timing changes how much of it is used.
With Rafhan Maize Products, across five grower sites at Khaliqabad, from application in August 2023 to harvest in October, assessed at 12 and 24 days. The comparison was deliberately uneven.
Across the parameters assessed — shoot length, colour, leaf number and vigour — the single 25 kg bag produced comparable crop growth on roughly a third of the applied nitrogen, with the sulfur included and at a comparable bag price. Observers also recorded better uniformity of plant height, improved grain formation, more milk-line development and better disease tolerance. Cob size and length showed no difference.
A replicated maize trial at VAN's trial station: two stage-timed applications of sulfur-coated urea — at the 4–6 leaf stage and again twenty days later at 8–12 leaf — against a conventional programme of five applications of uncoated urea followed by calcium ammonium nitrate.
Coated nitrogen releases across the crop's demand curve instead of flushing and volatilising, so fewer, better-timed applications deliver more to the plant than more frequent applications of a form that does not stay put.
Umair, A., Manzoor, M., Saleem, M. S., Akram, S., Ali, M., Batool, A., Javaid, T., Javaid, A., Sharif, M. N. & Haider, M. S. (2025). Efficacy Evaluation of Different Doses of Nitrgenous Fertilizers on the Growth and Yield of Maize (Zea mays). Planta Animalia 4(3), 129–135. DOI 10.71454/PA.004.03.0126. Randomised complete block design, three replications, DK-6321 hybrid, spring season 2024.
Stage by stage, with product, rate and application method printed for each stage.
Crop nutrition plans →The other half of the argument: what the crop needs and when, and the grades VAN is building to match it.
See where this goes →The national picture: usage, balance, productivity and where the nitrogen goes.
The evidence →We build to brief — ratio, form, solubility, particle size and pack — for the system the product will actually go out through.
