Zinc Polyphosphate
A micronutrient fertiliser specified under the Fertiliser Control Order, 1985 (Schedule I, Part A, 1(g), item 19). Key notified values: Appearance free flowing; Zinc 16.0 min; DTPA soluble Zinc 15.0 min. Added by S.O. 3224(E) of 3 Oct 2017.
Tip This is a compliance tool, so it is best viewed on a desktop or laptop. The phone version shows everything too.
Specification
As notified in the Order, line by line. Values are per cent by weight unless the line says otherwise.
How to read this table
- Minimum means the product must contain at least this much; maximum means not more than this (moisture, impurities and heavy metals have a maximum).
- Per cent by weight means grams in every 100 g of product: 0.5 per cent zinc is 5 g of zinc in every kg.
- Tolerance: a lab result may fall slightly short of the notified value before the sample is called non-standard; the limits are in Schedule I, Part B.
- S.O. … (E) is the number of the Gazette notification that made a change; “in force” (w.e.f., with effect from) is the date it started to apply.
| Parameter | Notified value | |
|---|---|---|
| (i) | Appearance | free flowing |
| (ii) | Zinc (as Zn) per cent. by weight, minimum | 16.0 |
| (iii) | DTPA soluble Zinc (as Zn) per cent. by weight, minimum | 15.0 |
| (iv) | Water soluble Zinc (as Zn) per cent. by weight, maximum | 1.0 |
| (v) | Magnesium as Mg per cent. by weight, maximum | 9.0 |
| (vi) | Lead as Pb per cent. by weight, maximum | 0.003 |
| (vii) | Arsenic as As per cent. by weight, maximum | 0.01 |
| (viii) | Cadmium (as Cd) per cent. by weight, maximum | 0.0025 |
Note for all micronutrient fertilisers (S.O. 4477(E), 22 Sep 2022): The Micronutrient Mixture grades are made by physically mixing of above specified fertilizers or grades.
Tolerance: how far a sample may fall short of a declared value is set in Schedule I, Part B; see the tolerance limits.
Test method (Schedule II, Part B): method 32: Zinc polyphosphate.
Check a lab report
Compare the results of a lab test with this specification, line by line, including the tolerance allowed in Part B. Enter each result as on the report (per cent by weight unless the line says otherwise). A guide only: the report of a notified laboratory decides whether a sample is standard.
| Parameter | Notified | Lab result | Result |
|---|---|---|---|
| (ii) Zinc | 16.0 mintolerance 0.5 units | ||
| (iii) DTPA soluble Zinc | 15.0 mintolerance 0.5 units | ||
| (iv) Water soluble Zinc | 1.0 max | ||
| (v) Magnesium as Mg | 9.0 max | ||
| (vi) Lead as Pb | 0.003 max | ||
| (vii) Arsenic as As | 0.01 max | ||
| (viii) Cadmium | 0.0025 max |
Not checked here: Appearance.
Notification history
- 3 Oct 2017S.O. 3224(E): entry inserted
- 21 Sep 2021S.O. 3901(E): line (v) substituted (was “3.0”)
Before you make, label or buy it
- Manufacturers and importers: each declared value on the label must meet the limit above; samples are tested by the notified method.
- Dealers and farmers: check that the product name and declared contents on the pack match this specification, and keep the bill with the batch number.
- Doses are not part of this specification: follow the label and local agricultural advice.
Questions? Ask our agri expert on WhatsApp.
Read more on NanoKheti
Show more micronutrient fertilisers 28 others
Consolidated by NanoKheti from the Fertiliser (Inorganic, Organic or Mixed) (Control) Order, 1985, as amended up to the Ninth Amendment Order, 2026 (S.O. 4045(E), 22 Jul 2026), for reference. The Gazette text is authoritative; this page is not legal advice. Check the notification before labelling, licensing or buying. Checked for later changes on 20 October 2026.