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Soil Chromatography with Eugenio Gras

November 6, 2011 | Appropriate Technology, Biofertilizer, Courses + Workshops | 16 comments | Author:

Soil Chromatography is both incredibly beautiful and incredibly useful, all at once. It’s a way of assessing your soil for humus, minerals, microbiology and more.

Best of all, you can do this soil assessment effectively at home – no need to send off tests to a faraway lab. Maybe that’s why soil chromatography hasn’t caught on in the western world yet – it’s a bit too DIY and open source for our patent-rich way of agriculture…

This technique was taught to us by Eugenio Gras as part of the biofertilizer workshop we just ran at Milkwood Farm. We asked all the students to bring with them a sample of soil from their home, so that they could take home their first soil chromatogram, a pictograph of what’s happening in their soil. The first of many, we hope!

Soil chromatography is actually a photographic process. Finely ground soil is absorbed by filter paper that has been prepared with silver nitrate, and thanks to capillary action, a ‘picture’ of that soil appears.

Eugenio and the rest of the crew at Mas Humus in Mexico use chromatography with their campesina farmer networks – it’s super cheap, easy to learn and a highly effective way of assessing your soil’s improvement over time, without costly laboratory soil tests.

We’re looking forward to doing chromatography skill-shares every six months in Mudgee from this point forward – free DIY chromatography sessions for locals and whoever wants to come for the day.

We’re also looking forward to Vero translating Eugenio Gras’s Chromatography book from Spanish to English sometime soon, so we can share resources about this technique in more detail.

Stick with us and we’ll let you know when the translation is available.

Our chroma shed lab.
Student's soil samples, all ready to be ground up...
Grinding up the soil samples
Sieving the soil...

Soil dissolved and ready to make a chromatogram
All finished, the chromatograms are laid in the sun to develop

Vero and Harris checking out Mas Humus's chromatografia book...
Harris and Vero with their completed chromatograms
"Chromatografia", Mas Humus's how-to soil chromatography book

Chromatography resources:

While waiting for the translation, if you can read Spanish, you can read all about Mas Humus’s chromatography work in their beautiful recent book, Chromatografiá.

You can also have a look at Chromatography – Applied to Quality Testing - a booklet written by Ehrenfried Pfeiffer, a pioneer of chromatography.

The Biodynamic Association of India has an article on chromatography as applied to vegetables (not to soil, but operating on the the same idea).

Thanks, Eugenio!

Many thanks to Eugenio Gras and everyone at Mas Humus for sharing their knowledge with us all. Many thanks also to all the farmers and interested folk who attended this course.

Eugenio Gras was in Australia as part of the RegenAG 2011 Australian courses, of which we co-ordinate the NSW component.

Many thanks to Adam Shand, Olivier Sofo and Stephen Couling for the photos.

Related posts:



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16 COMMENTS


  • rebecca November 6, 2011 at 10:03 am | Reply

    Just loved watching the step x step progress of your Zuni. This method is something we could have put to good use in the paddocks years ago in NZ to slow down the runoff after heavy rains. Many paddocks were totally degraded by natural water courses gouging out (usually after the natural vegetation has been removed & commercial cropping or pasture introduced). It also doesn’t help when the farmer refuses to construct a dedicated drinking trough for the sheep & cattle, as they cave in the sides of streams trying to get to water. A cost-effective, pretty and practical method of reclaiming back the soil and hanging onto that water a bit longer.


  • eremophila November 6, 2011 at 12:29 pm | Reply

    As both a photographer(who loves macro work especially) and a gardener, I am captivated by this! Thanks for the links:-)


    1. milkwoodkirsten November 6, 2011 at 1:52 pm | Reply

      you are welcome!


  • Milton November 6, 2011 at 12:43 pm | Reply

    You can find Pfeiffer’s book much more inexpensively here: http://www.biodynamics.com/catalog/chromatography-applied-to-quality-testing-pfeiffer


    1. milkwoodkirsten November 6, 2011 at 1:46 pm | Reply

      Fantastic – thanks for the link Milton! Have changed the link in the article to this one…


  • Gordon Williams November 6, 2011 at 6:13 pm | Reply

    This is definitely science and art coming together for a win.


  • The eye of the soil | wanderingseeds November 6, 2011 at 9:39 pm | Reply

    […] read more about Eugenio’s workshop check out Milkwood’s article at http://milkwood.net/2011/11/06/soil-chromatography-with-eugenio-gras/ Advertisement Eco World Content From Across The Internet. Featured on EcoPressed IBM's […]


  • Chromatographs November 8, 2011 at 5:08 pm | Reply

    Indeed a wonderful post. I have been studying the chromatography, spectroscopy etc. and do look over the web for latest and informative stuff and just landed on your blog. Thanks for writing such good posts and as I have subscribed to your blog, I do expect that you will be posting nice stuff like this on a regular basis.


  • […] If you’re not sure what I’m talking about with this chromatography stuff, have a look at this chromatography article here. […]


  • David Wechsler January 25, 2012 at 3:53 pm | Reply

    Thanks – what a cool post – I would love to try this in my garden. While I have yet to look at your other links, I wonder if it could help identify any toxins in the soil?

    Thanks for introducing me to something new!


  • Mario January 31, 2012 at 7:42 am | Reply

    As i understood for soil chromatography AgNO3 is used but i find it difficult to obtain that chemical and it’s quite costly so does anybody knows if there is an alternative method or chemical that can be used instead AgNO3


  • […] is one of the Directors in the organisation ReGen Ag, to learn about bio-fertiliser production and chromatography.  This was a very well worthwhile exercise and Eugenio is currently here in Australia doing his […]


  • […] read more about Eugenio’s workshop check out Milkwood’s article at http://milkwood.net/2011/11/06/soil-chromatography-with-eugenio-gras/ facebook Twitter del.icio.us digg […]


  • Microbe Migration | champagnewhisky July 25, 2013 at 7:24 pm | Reply

    […] Chromatography of a soil sample, a low-tech method for assessing soil composition and health, including microbial population.Source: Eugenio Gras / Milkwood […]


  • […] are quite able to find that out for yourselves, and the following links should help you do that. Chromatography 1. Chromatography 2. Instead I wanted to record some of the thoughts and ideas that this new […]


  • […] test. The reigning expert in this field is Eugenio Gras with Mas Humus, and there are many  great online resources to learn more about […]



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