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
|Nitrogen rate||Sulphur recommendation guide|
|kg N/ha||kg SO3/ha||kg S/ha|
Nutrient offtake (removal) by winter and spring wheat and barley
|Nutrient||Offtakes (kg/t)||Offtakes (kg/ha)|
|Wheat and barley||Winter cereals||Spring cereals|
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
- Higher yields
- Better quality of grain proteins
- Improved baking, malting and feed quality
- Increased nitrogen use efficiency
Fertilizing Wheat and Barley with Polysulphate