Main features of Polysulphate fertilizer

• Ideal sulphur fertilizer with 48% SO₃ and additional benefit of potassium (K), magnesium (Mg) and calcium (Ca), all in sulphate form.
• Reduced risk of sulphate loss through leaching due to prolonged nutrient release pattern.
• Fully soluble, with all nutrients available for plant uptake during the growth period.
• Excellent spreading characteristics; spreads evenly and accurately in the field up to 36 m.
• Low chloride, very low salinity index, neutral pH, no acidifying effect.
• Natural mined mineral (polyhalite) approved for organic agriculture.
• UK produced fertilizer with a low carbon footprint.
  
  

Functions of S, K, Mg and Ca in cereal crops

• Sulphur is an essential constituent of proteins: it is required for the synthesis of three of the amino acids which make up true proteins.
• Potassium secures yield and quality, transport of sugars, stomatal control and is a co-factor of many enzymes. It reduces susceptibility to plant diseases and impact of drought and is essential for efficient use of nitrogen.
• Magnesium is fundamental for photosynthesis, being a central part of chlorophyll molecule, and is key to grain filling.
• Calcium for strong and healthy crops; it is a major building block in cell walls and reduces susceptibility to diseases.
  
  

Sulphur main dressing - guide recommendations

Nutrient offtake (removal) by winter and spring wheat and barley

Sources: UK Fertilizer Manual, PDA and UNIFA

Practical guidelines for fertilizing cereals with Polysulphate

• One Polysulphate application will supply all the sulphate needed by cereals.
• Polysulphate can be applied as a straight or included in a blend as part of a tailored fertilizer program.
• Sulphur is needed to balance the nitrogen applied so that complete proteins can be produced. Protein content is an important aspect of grain quality.
• 100 kg/ha Polysulphate is generally a suitable dressing for cereals, supplying all of the sulphur and calcium needed, and a large proportion of the potash and magnesium removed in the grain at harvest.
• Ensure sufficient potash is applied if straw is removed from the field.
• Apply Polysulphate in early spring, as growth starts in winter cereals – usually at the early tillering stage.
• For spring cereals incorporate Polysulphate into the seedbed at sowing.
  
  

Nutrients supplied by Polysulphate at the recommended dose (100 kg/ha) to cereal crops at 6-8 t/ha grain yield

Expected benefits

• Higher yields
• Better quality of grain proteins
• Improved baking, malting and feed quality
• Increased nitrogen use efficiency