Siman is an international supplier and exporter of nitrogen fertilizers – the nitrogen-based (N) fertilizers that drive plant growth, crop yield and soil fertility. Trading chemicals and fertilizers since 1994 and shipping to more than 90 countries across six continents, we supply the full nitrogen range in bulk and bagged form: urea (carbamide), ammonium nitrate, ammonium sulphate, ammonium thiosulfate solution and UAN.
Nitrogen fertilizers, as their name implies, refer to fertilizers that contain nitrogen and come in a liquid or salt form which can be absorbed by plants and trees as a nutrition element.
Nitrogen fertilizers are found in the nature but for the most part they are produced by extracting nitrogen from the atmosphere and converting it into a liquid or salt that makes it applicable to the soil.
This is done by various chemical processes such as: ammonia synthesis (Haber- Bosh process); oxidation and nutrification; UREA process and few others.
Nitrogen fertilizers are very important for the agriculture for various reasons:
- stimulate the growth and the development of plants;
- improve the quality of the harvest;
- help the process of the photosynthesis;
- nitrogen supports the health and the sustainability of plants;
- balance soil fertility.
Nitrogen is the nutrient plants need in the largest quantity. Nitrogen fertilizers deliver it in forms crops can take up – nitrate (fast-acting), ammonium and amide (urea). They differ mainly in nitrogen content, how quickly the nitrogen becomes available, physical form (granular, prilled or liquid) and whether they add secondary nutrients such as sulphur. The choice depends on crop, soil, climate and application method, which is why buyers usually source several nitrogen products rather than one.
Products offered:
- Ammonium nitrate
– A high-analysis nitrogen fertilizer with roughly half its nitrogen as fast-acting nitrate and half as ammonium, valued for quick crop response, especially in cooler conditions and on grassland. - Granular UREA
– The world’s most widely used nitrogen fertilizer, with the highest nitrogen content of the solid products. Its granular form is well suited to mechanical spreading and bulk blending. - Prilled UREA
– The same high-nitrogen urea (carbamide) in prilled form, used both in agriculture and as an industrial nitrogen source (for example in resins and technical applications). - Ammonium sulphate
– Supplies nitrogen together with sulphur, making it a good fit for sulphur-deficient soils and crops that respond to sulphur, also has a gentle acidifying effect on alkaline soils. - Ammonium Thiosulfate Solution
– A clear liquid nitrogen-and-sulphur fertilizer used in fertigation, in UAN blends and as a starter, valued for easy handling and tank mixing. - Urea Ammonium Nitrate (UAN)
– A liquid nitrogen fertilizer combining urea and ammonium nitrate in solution, easy to apply evenly through sprayers and irrigation, popular in large-scale row-crop farming.
Applications
Nitrogen fertilizers are the backbone of crop nutrition worldwide – for cereals (wheat, maize, rice), oilseeds, sugarcane, cotton, vegetables, grassland and plantation crops. They stimulate vegetative growth, support photosynthesis and protein formation, improve yield and grain quality, and help maintain balanced soil fertility across intensive cropping cycles. Beyond agriculture, urea and ammonium nitrate also serve industrial roles – urea in resins, technical fluids and animal feed supplements, and nitrogen products in various manufacturing processes. Because nitrogen requirements differ by crop, soil and season, most growers and distributors use a combination of the products above.
Sourcing nitrogen fertilizers internationally
Siman has been trading in chemicals and fertilizers since 1994 and exports to over 90 countries on six continents – from Bulgaria to Europe, Africa, the Americas, Asia and Australia. We work with well-verified suppliers and guarantee delivery time, quality and packaging, and if necessary, we organize an independent inspection of quality and quantity before shipment. We work on international delivery terms (CFR, CIF, CIP, DDU, DDP) and take care of the export documentation, so that buyers receive nitrogen fertilizer according to specification, delivered reliably.
Request a quote or check current availability – call +359 888 804 562, message us on WhatsApp or Viber, or send an inquiry through the contact form. Tell us the product, grade and destination market and we will come back with terms.
Frequently asked questions
Which nitrogen fertilizers does Siman supply?
We supply the full nitrogen range – ammonium nitrate, granular urea, prilled urea, ammonium sulphate, ammonium thiosulfate solution and UAN – in bulk and bagged form for agriculture and industry.
What is the difference between urea, ammonium nitrate and ammonium sulphate?
Urea has the highest nitrogen content, ammonium nitrate gives a fast crop response through its nitrate share, ammonium sulphate adds sulphur and suits sulphur-deficient or alkaline soils. Many buyers use a combination.
Which markets do you export nitrogen fertilizers to?
We ship to more than 90 countries across six continents and work on CFR, CIF, CIP, DDU and DDP terms with full export documentation.
Can I check quality before shipment?
Yes. We source from well-checked suppliers, guarantee quality and packing, and can arrange third-party quality and quantity inspection before the goods are shipped.