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 30 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.

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.
Typically
Maximum
Maximum Units per 1 tonne
TNV ..... 58
68
TNV68
CaCO3 ..... 72%
80.5%
1610
AL203 ..... 1.5%
3.24%
65
B ..... 700ppm
853ppm
1.7
Ca0 ..... 49.6%
55.5%
1110
CL ..... 1.75%
2.04%
40.8
   
K20 ..... 0.03%
0.09%
1.8
Mg0 ..... 7.9%
10.00%
200
Mn0 ..... 3.6%
4.00%
80
P205 ..... 1.8%
2.48%
49.6
Zn ..... 126ppm
800ppm
1.0
Cu ..... 137ppm
154ppm
0.31
Mo ..... 45ppm
64ppm
0.13
Co ..... 4ppm
5ppm
0.01
So3 ..... 0.3%
0.35%
7.0

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:-

  • an effective source of phosphate

  • an effective source of lime

  • a source of essential trace elements

  • a release mechanism for locked up phosphates.

    • 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.

    Product
    P2O5 Applied
    (units/acre)
    P2O5 Taken up
    (units/acre)
    Uptake of P2O5 Applied
    Control
    none
    98
    N/A
    SuperSlag Basic
    72
    138
    56%
    TSP
    144
    150
    36%
    Gafsa
    144
    125
    19%

    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 ?

    Back to Super Slag

    Tel: 07778 415230 or 07787 188851
    email:npk.ltd@btinternet.com

    Orchard Way, Venlake, Uplyme, Lyme Regis, Dorset, DT7 3SA UK