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*Biochar* has to be one of the most important farming "discoveries" of our time, even though people across all cultures have been making and using it for thousands of years!
In this video, I will be talking about all the HUGE benefits of biochar, and also will tell you why crushing your biochar to very small particles is NOT a good idea!
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*MY OTHER BIOCHAR VIDEOS*
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Just finished as well. For anyone reading, 1.75x or 2x speed is still understandable.
It’s a good starter video. It probably oversells the benefits a tad, the ‘potential’ is there for improvement over time and I guess he indicates as such. I’m always wary about “miracle” product labeling.
There are quite a few studies about biochar particle size which he didn’t reference, and as Cade mentions, the structure is visible only under an electron microscope, crushing the char into a particle size that matches horticultural sizing isn’t a bad thing. Dust has its issues, no one recommends biochar crushed to dust, not that I’ve seen anyway.
I did a quick LLM search on particles and it references a couple of the particle studies:
The ideal size of biochar particles depends on the specific application and soil type. Here are some key points to consider:
Water retention and availability: Smaller biochar particles have higher water retention and availability, making them suitable for light-textured soils[4]. Most biochar intrapores have diameters less than 0.01 mm, which provide a water potential of less than -16.5 kPa[2].
Improvement of heavy clay soils: Biochar particles smaller than 3 mm have the most significant impact on improving heavy clay soils[1].
Plant growth and biomass production: Plant biomass production is generally maximized at intermediate biochar particle sizes, with particle sizes of 0.5-2.0 mm showing the best response[3].
Soil hydraulic properties: Biochar particle sizes of >2 mm, 2-0.5 mm, and 0.5-0.25 mm are hydrophilic, whereas 0.25-0.063 mm and <0.063 mm are hydrophobic[6]. This can affect the soil’s ability to absorb and retain water.
Amazonian terra preta: Most biochar particles found in Amazonian terra preta are between 10 and 20 μm (micrometers)[5].
In summary, smaller biochar particles are more suitable for improving water retention and availability in light-textured soils, while larger particles are better for enhancing plant growth in a variety of soil types. The specific application and soil conditions should be considered when determining the ideal size of biochar particles.
Citations: [1] https://permies.com/mobile/t/152616/Biochar-particle-size-matter [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5466324/ [3] https://www.mdpi.com/2073-4395/13/5/1394 [4] https://www.sciencedirect.com/science/article/pii/S1319610320301502 [5] https://sfbiochar.com/?p=en.biochar_preparation [6] https://bsssjournals.onlinelibrary.wiley.com/doi/10.1111/ejss.13138