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Don't wreck our soil

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In 1885, when my great grandpa Ole Doxtad first ploughed the virgin land of his farm in Nebraska the soil contained over 100 tonnes of carbon per hectare.  Now that same soil contains about 5 tonnes.  That lost carbon is now in the atmosphere and has contributed about a third of the increase in atmospheric carbon dioxide since that time.  Most of that carbon was contained in the microbial life of the soil, mostly mycorrhizal fungi but along with thousands of species of fungi and bacteria, all working harmoniously to feed plants and protect them against disease.  Every time Ole's plough turned the soil, those fungi and bacteria died in their gazillions, decomposing into greenhouse gases.  What was left was dead dirt.  Yields went down.  Luckily tractors came along in the 1920s and Ole's son Lewis (Grandpa) could plough twice as deep as with horses, bringing up deeply buried organic matter to refresh his tired soils.  That worked for a while, then fertility fell off again.  Luckily after WW 2 artificial fertilisers were cheap and subsidised so farming could keep going.   Now the FAO (UN Food and Agriculture Organisation) says we have about 50 years of soil left before there is no land fit for farming.  Our luck has run out, whatever the GMO hucksters may promise. That's why 2015 is the UN International Year of Soils.

 

Healthy soil is rich in organic matter - decomposing plants and teeming microbial life.  The more microbial life there is the healthier the soil and the healthier the plants that grow in it.

 

Ploughing the soil breaks up that social community and forces it to rebuild, with many participants dying and decomposing during recovery. Adding artificial fertilisers to soil breaks the cycle of mutual nourishment between plants and the living soil, so microbial life dies off. Fungicides and pesticides are the final knife in the heart of life in the soil. When the living organisms in the soil die, the soil dies with them and disintegrates.  Killing soil is a slow form of suicide by humankind.  With a 50 year deadline it’s time we did something about it.

 

Why are mycorrhizal fungi so important?  A plant uses sunlight and photosynthesis to convert carbon dioxide and water into sugar.  Some of that sugar is exuded through the plant's roots to feed the mycorrhizal fungi in the soil .  Why does a plant give away its precious sugar?  Because the payback is worth it. 

Those mycorrhizae use the sugar to feed the helpful fungi and bacteria in the soil:

the ones that convert nitrogen into nitrate fertiliser;

the ones that dissolve phosphorus to make it accessible to plants;

the the ones that fiercely defend 'their' plant against pathogens and pests that could kill or weaken their host plant.  Soil microbes are the probiotics of plants, keeping them healthy and well nourished while protecting them from disease.

 

Does this sound familiar?  We humans are just like the soil.  Our 'organic matter' is the kilo or two of microbial life that we call probiotics that inhabits our gut.  Their ‘soil’ is the food we eat, which feeds them. Like the microbial life in soil, these fungi and bacteria provide us with valuable nutrients and eradicate any disease-causing organisms that threaten our health.  They keep us happy and healthy.  The parallel doesn't stop there, though.  The soil is a vast living organism, stretching across continents with an interconnected ‘mind’ – a consciousness that spans countless numbers of tiny living beings.  Our gut flora also have a mind – neuroscientists call them the 'second brain' and 'gut feelings' are their manifestation in our first brain.  Sometimes what we think is our brain thinking a thought is actually a thought being controlled from the gut - all the more reason to eat well, keep the gut bacteria happy and think positive thoughts.

 

The cooperation among soil microbial life provides an admirable example of how cooperation and collaboration and sharing of food can benefit health and vitality.  A healthy soil, full of life, will support growth and yields equivalent to what can be achieved using chemical fixes. Just as a healthy gut will support life and vitality in humans, without recourse to sugar and antibiotics.

 

Our planet is blessed with an abundance of air, water and sunlight.   That's all that's needed to generate all the food we could ever need - as long as we don’t wreck our soils.

 

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