Let more growers get greater benefits

Home » Liquid & Granular Nitrogen Fertilizer

Liquid & Granular Nitrogen Fertilizer: A Buyer’s Screening Guide for UAN 32 and ASN

When buyers move from product research to supplier evaluation, a fertilizer name alone is not enough. The procurement team must verify nitrogen concentration, nitrogen source, sulfur content, physical form, storage behavior, market-specific certifications, quality control, and lead time. This article uses the documented product family of Taian Risso Chemical Co., Ltd. to show how those constraints should be assessed for UAN 32 liquid nitrogen fertilizer and ASN granular nitrogen fertilizer.

Taian Risso Chemical Co., Ltd. is a fertilizer manufacturer located in the High-tech Development Zone, Taian City, Shandong Province, China. The company was founded in 2007 and reports a factory area of 500,000 m², an annual production capacity of 2 million tons, and a professional team of more than 350 employees. Its product portfolio includes NPK fertilizers, UAN 32 solutions, ASN fertilizers, calcium ammonium nitrate, liquid fertilizers, controlled-release fertilizers, slow-release fertilizers, and specialty fertilizers. The relevant liquid and granular nitrogen product family is identified by model ASN (ANS), UAN 32.

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 Pressure Points That Affect Fertilizer Buyers

Market research published by SNS Insider valued the global liquid fertilizers market at USD 15.49 billion in 2025, with nitrogen as the largest revenue contributor. That figure indicates commercial scale, not a universal recommendation to replace granular products. Many buyers still need granular nitrogen for spreading programs and field-scale logistics.

Regulatory pressure is also influencing procurement. Research reported by Re Soil Foundation and Nature Food recommends a 20% cut in chemical fertilizer use by 2030 to support EU Green Deal nutrient-loss goals. This increases the importance of accurate application, balanced crop nutrition, and clear product documentation. Buyers are more likely to ask whether a product can be placed correctly and whether the nutrient program is matched to crop needs.

There is also an infrastructure consideration. Market analysis cited by Mordor Intelligence and the U.S. EPA indicates that UAN infrastructure costs can be approximately double those of dry storage, largely because stainless steel tanks and handling equipment are required. Therefore, the choice between UAN 32 and ASN is not only agronomic. It also involves capital expenditure, storage planning, and farm equipment compatibility.

Core Documentation: UAN 32 and ASN Product Parameters

Taian Risso Chemical Co., Ltd. describes this product line as liquid and granular nitrogen fertilizers. The product specification sheet includes two main formats: UAN 32 Fertilizer and ASN Fertilizer. The documented applications are complementary: UAN 32 Fertilizer is used for fertigation, foliar application, and soil application; ASN Fertilizer is applied as base fertilization, top dressing, and for field crops.

Documented parameters for liquid and granular nitrogen fertilizer screening
Parameter	UAN 32	ASN (ANS)
Form	Liquid solution	Granular
Nitrogen content	32% N	Typically 26% N
Sulfur content	Not stated in UAN specification	Typically 13% S
Nitrogen forms	Urea nitrogen + ammonium nitrogen + nitrate nitrogen	Ammonium nitrogen + nitrate nitrogen
Appearance	Clear to slightly yellow liquid	White to off-white granules
Density	Approx. 1.32–1.34 g/cm³ at 20°C	Not stated
pH	Typically 7.0–8.0	Not stated
Freezing point	Approx. -10°C	Not stated
Granule size	Not applicable	Typically 2–4 mm
Moisture	Not stated	≤1.0%
Main composition	Urea + ammonium nitrate + water	Ammonium sulfate + ammonium nitrate
Application	Fertigation, foliar application, soil application	Base fertilization, top dressing, field crops

Buyers should interpret the table as a qualification baseline. Actual nutrient availability depends on crop type, soil condition, application method, timing, climate, and the full fertilizer program.

Compliance Documentation: ISO 9001:2015 and RoHS Verification

In an hvq_2-style evaluation, compliance documents are part of the product specification, not an afterthought. For the global market, the liquid and granular nitrogen fertilizer product is certified to the ISO 9001:2015 quality management system standard. The certificate number is 0891092R1M16Q8, and it is issued by ZSBC. The documented scope includes liquid and granular nitrogen fertilizers.

For EU-bound orders, the product also has a Verification of Conformity for RoHS compliance. The certificate number is DPWD/03/0570/2025, issued by Intercert Global Sp. z o.o. The applicable standards include 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. The issue date is 5 March 2025, and the expiry date is 4 March 2030.