Ortho Silicic Acid (OSA) 2.0% WSL
A beneficial element fertiliser under the Fertiliser Control Order, 1985.
Specification
As notified in the Order, line by line. Values are per cent by weight unless the line says otherwise.
| Parameter | Notified value | |
|---|---|---|
| 1. | Ortho Silicic Acid [Si(OH)₄], per cent. by weight, minimum / Plant available Silicon (Si) equivalent, per cent by weight, minimum | 2.0 / 0.6 |
| 3. | Matter insoluble in water percent by weight, maximum | 0.5 |
| 4. | Specific Gravity (g/m) | 1.07-1.15 |
| 5. | Sodium (as Na) per cent. by weight, Maximum | 0.10 |
| 6. | Total Chloride (as Cl) per cent. by weight, Maximum | 4.00 |
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 29: Plant-available silicon, Si(OH)₄ (CaCl₂ extraction, UV).
Label for this product
The front and back label of Ortho Silicic Acid (OSA) 2.0% WSL with your company's details, in the format the Order asks for. One PDF for your licence file and your designer.
This page gives you 1 of the 9 things your label needs. The generator adds the other 8 from your details:
- Notified specification, line by lineon this page
- The heading word (FERTILISER) and the Schedule reference
- FOR AGRICULTURAL USE ONLY and KEEP OUT OF REACH OF CHILDREN
- Net quantity and unit sale price
- MRP (inclusive of all taxes)
- Batch number, month and year of manufacture
- Licence number
- Manufacturer or marketer: name and address
- Customer care: address, phone and e-mail
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Notification history 3 entries
- 1 Dec 2018S.O. 5887(E): entry inserted
- 31 May 2021S.O. 2126(E): line 6 substituted (was “0.5”)
- 22 Sep 2022S.O. 4477(E): a line omitted (it read: “2. pH (1% solution in distilled water @ 20°C) 1.7-2.2”)
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.