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SF60 Biochar Super Compost (Soil Improver)

  • Product Code: SF60
  • Availability: In Stock

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SF60 Biochar Super Compost (aka soil improver, activated biochar)

Made in the UK using our propriety composting process and humification agent.

  • 100% Organic, 100% natural and sustainable ingredients
  • Contains high levels of colloidal humus (approx 38%), biochar (20%), plant macro and micronutrients (2%) and compost (40%). 

Add SF60 directly to garden soil or mix with homemade compost at the point of planting. 

We want all our customers to be happy, please note:

SF60 is a soil improver

  • It does not look or feel like traditional compost
  • It is a mix of biochar, colloidal humus and only 40% compost
  • It will arrive damp and sticky
  • It is black and soil like in structure (although it contains no soil)
  • It is an excellent soil improver and addition to growing media.  
  • It is not, and should not, be used solely (on its own) to grow plants in.   

We have lots of blogs/articles describing what it is and how it works. If in doubt, we would much rather you contact us or read further before purchase. 

In our SF60 tests, we have seen an increase in plant and crop growth of 100% over the control soil. All plant growth testing is complex and it takes many test replications over a number of years before the average increase can be quoted. We believe most users can conservatively achieve a +20% increase.

How does SF60 work

The biochar/colloidal humus matrix acts as ‘sponge’ for water and essential nutrients – storing them ready for use. The ‘sponge’ matrix supports increased levels of soil microbes. The microbes (notably mycorrhizal fungi) can access the stored nutrients. They form symbiotic relationships with plant roots and supply nutrients to the roots. This mechanism leads to improved plant health and growth. (More detail via our SF60 FAQ blog post)

SF60 Features

  • Excellent water holding capacity, (X3 toX4 own weight, versus PAS100 compost X2).
  • Excellent water retention (days versus hours for compost)
  • Excellent re-wetting ability (re-absorbs water very quickly after partial drying)
  • Contains both fast and slow-release macro-nutrients (NKP) supply
  • Contains plant micro-nutrients (Ca, Mg, etc)
  • Improves nutrient supply to plant roots (increased microbe/fungal roots associations that increase nutrient supply to roots (eg mycorrhizal fungi, AMF)
  • Reduces nutrient leaching – colloidal humus has high CEC reducing leachate losses on irrigation
  • Improves soil aggregation leading to improved tilth and aeration (essential oxygen flow to roots and microbes)
  • Results are long-lasting - colloidal humus and biochar typically survive in the soil for over 100 years (note nutrients transferred and removed via crop need replenishing)
  • Positive environmental impact: colloidal humus and biochar both sequester carbon and help offset carbon dioxide and hence reduce the impact of greenhouse gases (1Kg SF60 equates to 1.8 Kg CO2)

Pack sizes

  • 10 Kg sack (approx. 15 litres)
  • 20 Kg sack (approx. 30 litres)
  • Contact us to discuss bulk 1m3 bags

How much biochar should I apply to the soil?

  Apply  Approx. Volume Ratio
Target 2-5 Kg/m2 5-10%
Minimum 0.5 Kg/m2 1%
Maximum 10 Kg/m2 20%

The % volume ratio varies with depth of soil mix. For more detail on application rate calculations by area, volume and weight and tips on how to make your budget go further, please visit the application ratio blog. We also have a free Excel calculator if you need to work out accurate application ratios.  

It is important to dig (or hoe) SF60 into the root zone - preferably to a depth of 5-10 cm.

SF60 can be stored in a cool dry place. Avoid direct sun and drying out 

SoilFixer SF60 is used to improve your soil to the best it can be. This improvement in soil fertility water, nutrient management and tilth results in better plants, vegetables and crops - and all in a sustainable manner.

How to use / Specification
How to use Dig or hoe into soil at a depth of 5-10 cm
Pack size 5, 10 and 20 Kg Woven PP sacks Contact us to discuss pallet loads or 1m3 bulk dumpy bags
Particle size 0-8mm, 100% passes through 8mm mesh sieve.
Weight 5, 10, 20 Kg . Please note product is sold 'damp'. Weights approx with 2% tolerance.

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