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Nitrogen fertilizers with sulfur

Saletrosan® 30

Fertiliser formula N(S) 30(7)
Manufacturer Grupa Azoty S.A.
Grain class: granules 2÷6 mm, no less than 95%
Bulk density: 0.98 kg/dm3

Total nitrogen (N) - 30%, including:
-nitrate nitrogen (NNO3-) at least 12 %
-ammonium nitrogen (NNO3-) at least 18 %
-SO3 (S) (water soluble) 17,5% (7%)

PKWiU (Polish Classification of Products and Services) number:
CN number: 31022900

Grupa Azoty S.A. (Tarnów)

The Saletrosan® 30 mineral fertiliser is ammonium sulfate-nitrate. It is obtained in a chemical process from ammonium nitrate and ammonium sulfate, with an addition of calcium- and magnesium-rich dolomite powder. Such technology guarantees an identical composition of each granule. It has the form of even granules coloured from brown to beige. Grains of the 2÷6 mm size constitute at least 95% of fertiliser weight.

Saletrosan® 30 contains 30% of total nitrogen (N), including at least 18% of nitrogen in ammonium form (NNH4+) and at least 12% in saltpetre form (NNO3-). Sulfur content (S) is 7%, which - calculated to sulfur trioxide - equals to 17,5% of SO3. The sulfate sulfur present in Saletrosan ®30 is fully water soluble, and therefore fully available to plants.

Thanks to the optimum granulation technology, utilised by Grupa Azoty S.A., and the innovative protection of an anti-caking agent, Saletrosan®30 granules do not cake, crumble, or abrade during transport or storage. The right weight and uniformity of granules enables long and uniform distribution in precisely measured doses, which reduces wastage of fertiliser in the soil and is decisive for the high effectiveness of fertilising.

Using Saletrosan® 30 in cultivation of winter cerealsSee more

When cultivating winter wheat and other cereals, Saletrosan® 30 should be used during spring fertilisation of the plantation. When applied at the beginning of spring vegetation (dose 1), Saletrosan® 30 excites plants to tiller, affecting the two main crop-creating factors, i.e. seeding density, and the number of spikelets and florets per ear.

Using the Saletrosan® 30 fertiliser during the stem elongation phase (2nd fertiliser dose) not only increases the number of spikelets formed per ear, but also limits the reduction of ear-bearing shoots, reduces plant susceptibility to diseases and increases their resistance to stress conditions, such as soil drought, low or high temperature.

In agricultural practice, winter wheat is most commonly fertilised on three dates, while the other cereals - on two. Using the Saletrosan® 30 fertiliser both at the start of spring vegetation and during the stem elongation phase ensures an optimum supply of nitrogen and sulfur for the cereals while performing only one agrotechnical operation every time.

Saletrosan® 30 can also be applied as a universal fertiliser, recommended for use in spring, as top dressing for winter plants, particularly cereals. It is also recommended for use in early spring for all other arable crops: winter rape, spring cereals, corn, industrial and root crops, as well as in cultivation of fruits and vegetables. Excellent effects of Saletrosan®30 fertilisation are achieved in cultivation of crucifers (rapeseed, agrimony, mustard plant, cabbage, cauliflower, kohlrabi), legumes, potato, onion, leek, garlic and horseradish. It is highly effective on organic soils, particularly grasslands.

When using Saletrosan® 30 pre-sowing, it is best to shallowly mix it with the soil, and when used as top dressing - to apply it before expected rain. Perennial crops should be fertilised in spring. Due to hygroscopicity, Saletrosan® 30 can be mixed directly before sowing with Polidap®, Polifoska®, Polimag® S and potassium salt, provided the fertilisers are dry.

BenefitsSee more

Due to the ratio of nitrogen to sulfur N:S = 5:1, Saletrosan®30 is particularly recommended for fertilising cereals. The sulfur contained in Saletrosan®30 results in improved nitrogen intake and use by the plants, which increases the effectiveness and efficiency of nitrogen fertilising.

The sulfate sulfur contained in the fertiliser, perfectly water soluble and thus easily absorbable by plants, affects effective use of nitrogen, reduces plant susceptibility to diseases and increases their resistance to stress conditions, such as soil drought, low or high temperature. Let us remember that the greatest sulfur shortfalls in the soil always occur in early spring, after this nutrient has been washed out from the soil during autumn and winter.

Nitrogen in ammonium form is not washed out from the soil, it is slowly and evenly drawn by the plants, it affects solid rooting of plants, supports the intake of of phosphorus, sulfur and boron, and limits excessive intake of potassium. The content of quick-acting, saltpetre form of nitrogen (typical for top dressings) accelerates plant vegetation shortly after fertiliser application, i.e. accelerates plant regeneration in spring after the winter enervation. Furthermore, this form of nitrogen improves the intake of potassium, magnesium and calcium.

Application of Saletrosan® 30 also results in strong plant rooting, increases their growth dynamics even in early development phases and increases their resistance, which are all crucial for crop growth and improvement of its quality.

Suggestions of dates and doses of fertilising with Saletrosan® 30See more

Nitrogen fertilisation needs

Assessment of factors affecting the nitrogen fertilisation needs (in accordance with the Institute of Soil Science and Plant Cultivation).

Type of factor

Assessment of the factor, in points




Liming needs


needed, recommended

limited, unnecessary

Winter precipitation

below standard


above standard

Forecrop and its fertilisation with nitrogen

legumes, root crops on manure, others on large doses of nitrogen

cereals, forage crops, rapeseed on average doses of nitrogen

cereals, forage crops, rapeseed on low doses of nitrogen

Selection of variety (grass species)




Level of chemical plant protection

no protection

partial protection

full protection

Duration of root and forage crops vegetation

short: for early harvest or direct feeding

average for the species

long: harvest in the process ripeness or for silo storage

Nitrogen fertilisation needs are very high or high when the points total is +6 to +1; average, when the points total is 0, low or very low for -1 to -6 points.


Nitrogen fertilisation needs

very low and low


rye, oats and other cereals - starter dose - spring



rapeseed - starter dose - spring



potato on manure2 - starter dose - spring



corn for grain - starter dose - spring



cabbage: white, red, Savoy, Brussels sprout, onion3 – spring



grasslands - organic soils - starter dose - spring



*the recommended dose of Saletrosan® 30 does not cover the nitrogen fertilisation needs, but is a spring starter dose in order to supply the plants mainly with sulfur; on soil with average nitrogen fertilisation needs, a dose of 400 kg Saletrosan® 30 applied to rapeseed introduces 120 kg of nitrogen and 24 kg of sulfur (S);
1 - if assessment of nitrogen fertilisation needs proves problematic, it is recommended to apply similar doses as for average fertilisation needs;
2 - the recommended dose of manure for potato 20-25 t/ha, for corn per silo 30-35 t/ha;
3 - starter dose used mainly a source of sulfur.

Paweł Franczyk - Director of the Bureau of Export Fertilizer
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