Sulfoammophos (Bulgaria) NP 20:20 + 13 S, Dnipropetrovsk region.

The most optimal fertilizer for sunflower is found sulfoammophos is a complex, highly concentrated nitrogen-phosphorus substance.

Physical and chemical characteristics.
Sulfoammofos is a complex sulfur-containing, nitrogen-phosphorus fertilizer. It has good physical properties: it does not stick, it does not dust, it is non-hygroscopic. Friability - 100%. Externally - even small light granules.
Depending on the brand, the fertilizer contains nitrogen 14, 16 and 20%, phosphorus – 20 or 34%, sulfur – 8–14%, calcium – 0.5%, magnesium – 0.5%.
Sulfoammophos combines the properties of ammonium, phosphorus and sulfur-containing fertilizers. At the same time, it has a better ratio of nitrogen and phosphorus, as well as the content of sulfur, calcium and magnesium, thanammophos.[6]

Sulfoammofos is used as afertilizer for various agricultural, decorative and fruit crops(//tractor-service.com)
culture.[1] It can be used for the preparation of mixed fertilizers. [6]

General information
NP 20:20 + 13 S - nitrogen-phosphorus fertilizer intended for feeding soils rich in potassium. It is suitable for fertilization of almost all crops, both for pre-sowing and for corrective fertilization. NP has a relatively low content of easily digestible nutrients, which makes it a good solution for any farm.

The balanced content of nutrients helps to fully satisfy the needs of plants in macronutrients.

The content of more than one element in the fertilizer also helps to better absorb nutrients from the roots of plants. In the presence of phosphorus, nitrogen is better absorbed by plants.