A granular fertilizer with an acidic effect that can be used directly or mixed with superphosphate or ammonium sulfate for application before planting or during winter servicing of fruit crops. It helps crops withstand unfavorable conditions (drought, frost, salinity) and is essential for increasing yield and improving fruit quality (color, size, sugar content, marketability, and storage ability). It is also rich in sulfur, which is essential for some crops, especially oil crops.