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Home » Liquid UAN 32 + Granular ASN Fertilizer: What to Verify Before You Evaluate a Nitrogen Supplier

Liquid UAN 32 + Granular ASN Fertilizer: What to Verify Before You Evaluate a Nitrogen Supplier

For agronomists, distributors and procurement teams working through the Research and Evaluation stage, this guide compares two complementary nitrogen products: UAN 32 liquid fertilizer and ASN 26-0-0+13S granular fertilizer. It also explains the specifications, certifications, application fit and supplier supply concerns that matter before a purchase decision.

Problem Definition: Why Nitrogen Fertilizer Selection Is Harder Than Reading Total N Percentage

A fertilizer buyer can usually find several sources of granular urea, UAN solution or ASN product. The challenge is not product availability. The challenge is evaluating which product form, nutrient forms and supplier documents are appropriate for the crop, the soil, the equipment and the end market. Three decision points are often underestimated:

Nitrogen form.Urea nitrogen, ammonium nitrogen and nitrate nitrogen are not identical agronomically. A liquid UAN 32 product contains urea nitrogen, ammonium nitrogen and nitrate nitrogen. An ASN 26-0-0+13S granule contains ammonium nitrogen and nitrate nitrogen.
Secondary nutrient content.Some nitrogen-focused fertilizers contain no sulfur. ASN 26-0-0+13S is positioned as a nitrogen and sulfur fertilizer because it supplies both nutrients in one granular product.
Verifiable compliance.A supplier can say that a product is certified, but a careful buyer should be able to confirm the certification number, the issuing body and the applicable market.

The risk is comparing products by total nitrogen alone. A liquid product with 32% N is not automatically the right choice if the crop also needs sulfur or if the farm does not have liquid application equipment. A granular 26% N product should not be rejected merely because its nitrogen percentage is lower when it is supplying valuable sulfur as well.

Industry Background: Liquid Nitrogen Demand and Nutrient-Use Pressure

Global liquid fertilizer commercial research estimated the liquid fertilizers market at about USD 15.49 billion in 2025, with nitrogen as the largest revenue contributor. The number is useful background, but the more practical point for buyers is that liquid nitrogen products are no longer a niche format. They are being evaluated alongside granular nitrogen fertilizers in field crop, horticulture and precision agriculture programs.

Regulatory pressure is also part of the evaluation environment. European Union nitrogen targets include a recommended 20% reduction in chemical fertilizer use by 2030 as part of the Green Deal nutrient loss goals. That does not mean crop nutrition will stop. It means fertilizers that can be timed, positioned and measured more carefully are likely to receive more attention. Liquid UAN 32 has a near-neutral pH range of about 7.0 to 8.0 and is designed for metered liquid application. Granular ASN supplies nitrogen and sulfur in a spreadable form for base fertilization and top dressing.

At the infrastructure level, buyers should remember that liquid fertilizer systems are different from dry fertilizer systems. One North American market review notes that UAN infrastructure costs can be approximately double dry storage costs, largely because of stainless steel requirements and liquid handling equipment. A liquid nitrogen product can offer application flexibility, but the cost of storage, transfer, pumping and injection must be included in the comparison.

Detailed Solution: UAN 32 and ASN 26-0-0+13S as a Liquid and Granular Nitrogen Portfolio

Risso Chemical, the brand used by Taian Risso Chemical Fertilizer Co., Ltd., is a fertilizer manufacturer based in the High-tech Development Zone, Taian City, Shandong Province. The company was founded in 2007 and has built a portfolio that includes compound fertilizer, water-soluble fertilizer, polymer coated fertilizer, liquid fertilizer, ammonium sulphate nitrate and urea ammonium nitrate 32. Its production profile lists 16 modern NPK fertilizer production lines, an annual capacity of 2 million tons, more than 350 employees and an R&D team of 50 engineers. The company exports to more than 60 countries and regions.
For buyers evaluating liquid and granular nitrogen fertilizers, the more practical question is whether the supplier can provide both a liquid nitrogen solution and a granular nitrogen-sulfur option with consistent documentation.

UAN 32 Liquid Nitrogen Fertilizer

UAN 32 is a liquid nitrogen fertilizer with a total nitrogen content of 32%. It is a solution whose main composition is urea, ammonium nitrate and water. UAN 32 contains three nitrogen forms: urea nitrogen, ammonium nitrogen and nitrate nitrogen. That triple-nitrogen-source structure is one reason UAN 32 is often discussed for precision liquid feeding and fertigation rather than as a direct substitute for a conventional dry urea product.

The technical profile for UAN 32 used in this article describes it as a clear to slightly yellow liquid solution with a density of approximately 1.32 to 1.34 g/cm³ at 20°C, a pH of typically 7.0 to 8.0 and a freezing point of approximately -10°C. UAN 32 is used for fertigation, foliar application and soil application. It can be metered into irrigation systems or applied as a liquid side-dressing where equipment is available. Liquid fertilizer logistics commonly include IBCs, drums and tankers, so tank and transfer-system planning is central to UAN adoption.

ASN 26-0-0+13S Granular Nitrogen-Sulfur Fertilizer

ASN 26-0-0+13S, also referred to as ammonium sulfate nitrate, is a granular fertilizer that typically provides 26% nitrogen and 13% sulfur. Its main composition is ammonium sulfate and ammonium nitrate. The nitrogen in ASN is supplied in nitrate and ammonium forms, while the sulfur component provides an additional nutrient source. This makes ASN a dual-nitrogen granular fertilizer with a nitrogen-sulfur nutrient profile.

Granular ASN 26-0-0+13S fertilizer as referenced in the product specification unit

The typical physical profile for ASN includes white to off-white granules, a granule size of about 2 to 4 mm and moisture content no greater than 1.0%. ASN is applied as base fertilization, top dressing and for field crops. It is usually evaluated when a crop program needs both nitrogen and sulfur, particularly in cereals, oilseed crops and other field crops where sulfur is part of the nutrient recommendation.

ASN and ammonium sulfate are different products. ASN combines nitrate nitrogen and ammonium nitrogen with sulfur, while conventional ammonium sulfate primarily supplies ammonium nitrogen and sulfur. In practical terms, ASN is a granular option for situations where the crop would benefit from both nitrate and ammonium nitrogen plus sulfur.

Certification Baseline for Liquid and Granular Nitrogen Fertilizer

Before discussing agronomic use, a buyer should verify that the fertilizer supplier can show relevant certificates. For the liquid and granular nitrogen product evaluated in this article, the certification baseline is clear. The product is certified to the ISO 9001:2015 quality management system standard. The certification number is 0891092R1M16Q8, issued by ZSBC, and the certification is applicable to the global market for the nitrogen fertilizer product in liquid and granular form.

For shipments to the European Union market, the product is also certified under RoHS compliance requirements. The RoHS certification number is DPWD/03/0570/2025, issued by Intercert Global Sp. z o.o. Buyers should request not only the certificate image but also the applicable standards, product models and valid period. For this product family, the applicable RoHS documentation references harmonized standards including EN 62321-4:2014+A1:2017, EN 62321-5:2014, EN 62321-7-1:2015, EN 62321-7-2:2017, EN 62321-6:2015 and EN 62321-8:2017.

Liquid & Granular Nitrogen Fertilizer