Getting the best from Polysulphate
Polysulphate™ fertilizer has a number of key benefits, which makes it an ideal choice of sulphate fertilizer for farmers. It offers the chance to fulfil the potential of a range of crops.
- Readily available –already in its soluble, sulphate form for immediate use
- A new granular form of sulphur, offering flexibility to tailor application to field requirements
- Concentrated, so has a low storage requirement and is quick to spread
- A source of potassium, magnesium and calcium – an added bonus
- Low in chloride, so suitable for chloride-sensitive crops
- Environmentally benign as it used in its natural state – no processing or waste product, and non-acidifying
- UK-sourced and a secure supply of fertilizer with a low carbon footprint.
Advice for arable crops
Polysulphate can be applied in one dressing at the beginning of spring growth. The aim is to match the sulphur requirements to the crop’s nitrogen needs.
Where nitrogen rates are varied, in precision farming systems for example, the Polysulphate dressing can be independently varied to best match overall nitrogen applications.
Cereals and oilseeds
- Apply as a straight fertilizer at the start of spring growth
- Readily available, the crop will take it up with the nitrogen over the spring growing period
- Apply to oilseed rape to optimise yield, protein and oil synthesis
- Apply to bread-making wheats for yield and to ensure grain protein quality
- Apply to malting barley for yield and quality
- Apply in the seedbed or soon after emergence
- A zero-N fertilizer, bringing readily available sulphur to the crop
- Used by the plant at an early stage to feed the nitrogen-fixation process, which occurs within the root nodules and for protein synthesis in the plant.
Brassica field vegetables
- Brassica crops have been shown to be particularly responsive
- Apply as a base dressing, especially on high-risk light soils
Advice for livestock farmers
Applications of manure and slurry cannot be relied on as a source of available sulphate, and are best considered as maintaining soil reserves (see Sulphur from manure and slurry).
So Polysulphate should be applied in line with nitrogen requirements as necessary to achieve optimum grass growth throughout the season at the correct N:S ratio.
- Apply after each cut of silage to complement nitrogen uptake and maintain N:S ratio.
- On lighter soils an application at the start of the spring may also be required.
- Apply after stock is moved on in rotational systems
- If set-stocked, and especially on lighter soils, apply early at the start of spring.
- Provides an excellent sulphur boost for later-growing clover
- Apply as spring growth gets underway – earlier growing ryegrass will have taken up soil sulphur reserves.