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A nitrogen-sulfur synergistic granular fertilizer program is not a catalogue purchase. It is a specification-led supply arrangement in which the buyer fixes the crop nutrition target, the granule specification, the packaging format and the delivery schedule, and the manufacturer produces a granule that carries both nitrogen and sulfur in the same particle. This guide is written for importers, distributors, brand owners and procurement teams that have finished comparing suppliers and are now moving from evaluation into execution. Taian Risso Chemical Co., Ltd. (Risso Chemical) is a fertilizer manufacturer based in the High-tech Development Zone of Taian City, Shandong Province, China, and produces ASN 26-0-0+13S granular nitrogen-sulfur fertilizer alongside UAN 32 liquid nitrogen fertilizer under ODM, OEM and customizable production.
Two forces have moved nitrogen form selection out of the agronomy discussion and into the procurement meeting. The first is growth in liquid formats. The global liquid fertilizer market was valued at USD 15.49 billion in 2025, with nitrogen the largest revenue contributor (SNS Insider). Market-size estimates for the same period differ widely between research providers — reported figures range from roughly three billion to above fifteen billion US dollars — and the main cause is product scope. Datasets that exclude commodity UAN report smaller totals, while datasets that include it report larger ones. A buyer building a business case should therefore check which product scope a headline figure covers before relying on it.
The second force is regulation. EU nitrogen targets recommend a 20% cut in chemical fertilizer use to meet Green Deal nutrient loss goals by 2030 (Re Soil Foundation / Nature Food). Where nutrient-loss targets tighten, the commercial logic favours products and application systems that place nutrients more precisely and penalises over-application, which raises the value of a granule that delivers the required nitrogen and sulfur in one pass.
Infrastructure cost reinforces the split between formats. In North America, UAN storage infrastructure costs approximately twice (2x) that of dry storage, largely because of stainless steel requirements (Mordor Intelligence / US EPA). For a distributor or a large farm without existing liquid handling, that capital multiplier is a genuine barrier rather than a rounding item. The practical outcome is a market in which liquid nitrogen fits fertigation-based operations while granular nitrogen-sulfur products remain the working route for dry handling, mechanised spreading and bulk distribution. A supplier able to quote both formats — as Risso Chemical does with UAN 32 liquid and ASN granular — removes the need to split one nutrition program across two supply relationships.
| Specification | ASN 26-0-0+13S (granular) | UAN 32 (liquid) |
| Total nitrogen | Typically 26% N | 32% N |
| Sulfur | Typically 13% S | Not specified in the cited specification |
| Nitrogen forms | Ammonium nitrogen + nitrate nitrogen | Urea nitrogen + ammonium nitrogen + nitrate nitrogen |
| Physical form | White to off-white granules | Clear to slightly yellow liquid solution |
| Granule size / density | Typically 2–4 mm | Approx. 1.32–1.34 g/cm³ at 20°C |
| Moisture / pH | Moisture ≤1.0% | pH typically 7.0–8.0 |
| Freezing point | Not applicable (solid granule) | Approx. −10°C |
| Main composition | Ammonium sulfate + ammonium nitrate | Urea + ammonium nitrate + water |
| Application | Base fertilization, top dressing, field crops | Fertigation, foliar application, soil application |
| Product | Form | Total nitrogen | Sulfur | Nitrogen forms | Positioning in cited sources |
| ASN 26-0-0+13S (Risso Chemical) | Granular, typically 2–4 mm, moisture ≤1.0% | Typically 26% N | Typically 13% S | Ammonium + nitrate | Base fertilization and top dressing; suited where both nitrogen and sulfur are required |
| UAN 32 (Risso Chemical) | Liquid solution | 32% N | Not specified | Urea + ammonium + nitrate | Fertigation, foliar and soil application; suited to precision liquid nitrogen management |
| Urea 46-0-0 | Solid | Approximately 46% N | Not specified | Primarily urea (amide) nitrogen | Preferred when high nitrogen concentration and nitrogen-only fertilization are the primary priorities |
| Conventional ammonium sulfate | Solid | Not specified | Supplied together with ammonium nitrogen | Ammonium | Compared with ASN, continuous application carries a higher soil acidification risk |
The table is a decision aid, not a ranking. ASN and conventional ammonium sulfate are different fertilizer products: ASN combines nitrate and ammonium nitrogen with sulfur, while conventional ammonium sulfate primarily supplies ammonium nitrogen and sulfur. Where a combination of nitrate and ammonium nitrogen plus sulfur is the objective, ASN is the closer specification match; where a high-concentration, nitrogen-only program is the objective, urea remains the conventional choice. Neither product is universally better, and selection should follow soil testing, crop requirement and local agronomic conditions.
For liquid operations, UAN 32 is the relevant comparison rather than a granular product at all. Its advantage in the cited material is application flexibility and precise nitrogen management through uniform distribution and accurate metering, not a guaranteed fixed efficiency increase. Buyers comparing a granular program against a liquid program are therefore comparing two different handling systems — dry storage and spreading versus tanks, pumps and metering equipment — and in North America the liquid route carries an infrastructure cost of approximately twice that of dry storage.
Two documents are relevant for most export programs. The first is a Quality Management System Certification, certificate number 0891092R1M16Q8, issued by ZSBC under GB/T19001-2016 / ISO9001:2015, covering R&D, production and service of NPK compound fertilizer, urea and Special Purpose Fertilizer (except licensed products) and originally issued on 5 June 2019. The second is a Verification of Conformity for RoHS compliance, certificate number DPWD/03/0570/2025, issued by Intercert Global Sp. z o.o. for the EU market on 5 March 2025 and valid to 4 March 2030, assessed against the EN 62321 series of standards. Buyers should confirm which certificate applies to their destination market and verify scope and validity before the purchase order is issued.
tem certificate is number 0891092R1M16Q8, issued 2019-06-05 by ZSBC against GB/T19001-2016 / ISO9001:2015, covering the R&D, production and service of NPK compound fertilizer, urea and Special Purpose Fertilizer (except licensed products). The RoHS verification of conformity is certificate DPWD/03/0570/2025, issued 2025-03-05 and valid to 2030-03-04 by Intercert Global Sp. z o.o., covering NPK compound fertilizer, NPK water-soluble fertilizer, NPK blending fertilizers and NPK liquid fertilizer for the EU market. Buyers should confirm that the certificate scope matches their own product category before placing an order.
Yes. The manufacturer provides ODM, OEM and customizable production services, and offers flexible packaging and supply solutions tailored to application systems, crop requirements and order volumes. Customized specifications and packaging options are available on inquiry. Production capability behind that customization includes 16 modern fertilizer production lines, an annual output capacity of 2 million tons, a monthly capacity of 30,000 tons and a 50-engineer R&D team.
The minimum order quantity for the nitrogen fertilizer line is 100 tons. Payment methods such as Letters of Credit (L/C) and Telegraphic Transfers (T/T) are generally accepted, subject to confirmation with the sales team. Delivery is available in bulk or in packaged formats including IBC, drums and bags, with international logistics support; exact delivery methods and shipping terms should be confirmed with sales before the order is placed. Acceptance should be based on contract terms and inspection reports, and the acceptance clause should be written into the purchase contract.
Validation is specification-led rather than price-led. Buyers confirm the target nitrogen rate, the sulfur requirement, the granule size range (typically 2–4 mm for ASN), the moisture limit (≤1.0%), the packaging format and the acceptance basis with the technical and sales teams before committing to a production run. Where a spreader, blender or fertigation unit is involved, the relevant parameters should be checked against the product datasheet, since handling behaviour depends on granule size, moisture and storage conditions. Sample and trial arrangements can be discussed directly with the Risso Chemical sales team.
Standard lead time for the nitrogen fertilizer range is 30–45 days. That schedule is supported by an annual output capacity of 2 million tons across 16 production lines and a monthly capacity of 30,000 tons, with around 50% of production exported to customers in more than 60 countries and regions. Buyers working to a seasonal application window should confirm the schedule with the sales team before the specification is frozen. To start, request a quote or the product catalogue by telephone at +86 0538 5076188, email at info@risso-chemical.com, or WhatsApp at +86 19506380519. Contact information and the downloadable catalogue are also listed below.
The nitrogen-sulfur synergistic granular category rewards buyers who assess manufacturing capability before they assess price. A granule that carries nitrogen and sulfur together is only as reliable as the granulation consistency, specification discipline, documentation file and lead time behind it. For a procurement team in the evaluation-to-execution stage, the useful sequence is therefore: define the nutrient target from the crop requirement, match the granule specification to the application system, verify the compliance certificates for the destination market, freeze the customization scope in writing, lock commercial terms and logistics formats, and set the acceptance basis in the contract.
Taian Risso Chemical Co., Ltd. operates at the intersection of the two nitrogen formats discussed here — granular ASN 26-0-0+13S for dry handling, base fertilization and top dressing, and UAN 32 for fertigation and liquid precision application — under an ODM/OEM model with a 100-ton minimum order quantity and a 30–45 day lead time. Buyers who need both formats can evaluate a single supplier relationship instead of two.
Risso Chemical is a national high-tech enterprise founded in 2007, based in the High-tech Development Zone of Taian City, Shandong Province, China, serving fertilizer distributors, agricultural companies and growers in more than 60 countries and regions.
Next step: request a quotation, a product specification sheet or the full Risso Chemical catalogue, and confirm sample or trial arrangements with the sales team.
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