NPK LTD, suppliers of steelworks slag (Ag Slag) from the Port Talbot South Wales steel works were responsible for reviving the production of agricultural slag from this site around 20 years ago after a break of many years. Our brand name 'SuperSlag Basic' has become increasingly well known in the industry. This last 2 years have seen sales grow to record levels with more and more farmers becoming regular users having recognised the benefits and value for money. Slag is also supplied from Scunthorpe and Teesside.
Grow Better Grass & Crops with SuperSlag Basic and related products
Just as effective on arable crops, particularly
Oil Seed Rape
'Nothing else contains so much for so little!'
Typical Analysis of Steel Works Slag
Steel works slag varies slightly, but
typically contains the following elements. Also recorded are commonly
found maximum contents.
These samples were analysed by various laboratories from steel works slag from South Wales.
Steel Works Slag
Steel works slag is a by-product of the basic oxygen steel making process used by Corus at their Port Talbot, Scunthorpe and Teeside works.
Like the old basic slag our grade of steel works slag called Super Slag Basic is principally a lime based material which has absorbed the oxides and trace elements arising from the refining of iron. Although it contains less phosphates than the old basic slag. Super Slag Basic produces a high phosphate response in the soil owing to its soil conditioning properties. Field trials and practical experiences have shown that steel works slag performs exceptionally with significant improvements in crop yield and pasture quality.
Super Slag Basic has similar neutralising properties to that of ground limestone and is applied to the land at a similar rate, appropriate to its pH level. At the maximum recommended rate of 1.5 tonnes/acre, it provides around 38 units of phosphate together with magnesium, manganese, boron and a wide range of trace elements essential for healthy crops and animal wellbeing.
On spreading, Super Slag Basic acts in four ways. It provides:-
Super Slag Basic is crushed down to a size that is agronomically effective. It is safe to handle and easy to spread and is prepared to 4 ml to dust particle size. This size gives the optimum release of nutrients whilst enabling ease of handling and spreading.
The remarkable performances of steel works slag has been established through extensive field study trials carried out by Newcastle University. Increases in dry matter yield were recorded over a three year period for Cockle Park (soil pH=5.4) and New Deanham (soil pH=4.8).
Slag spread at 1.6 tonne/acre. Limestone spread at same neutralising level as slag. TSP spread at same phosphate level as slag. Yield increase with slag over 3 times that of limestone of TSP at Cockle Park and more than double at New Deanham.
The herbage uptake of P205 was measured at Cockle Park where steel work slag again performed exceptionally well.
Increase in uptake of P2O5 with steel works slag over 50% more than with TSP and three times more than with gafsa.
Basic slag was thought by many to be the best grassland fertiliser ever. Super Slag Basic is its modern day equivalent, rich in calcium, magnesium, phosphate and essential trace elements.
Super Slag Basic is good for your land; it replaces the trace elements and minerals which basic slag used to provide. It gives substantial increases in crop yields, sweetens pastures and is beneficial to grazing livestock.
Can you afford not to use it ?