Improve your soil, help the planet

Linda Cockburn believes gardeners have a crucial job to do, storing carbon in their soils. It will help with your harvest, as well as helping stave off the worst effects of the climate crisis. 

We can store carbon in our soil and so help combat climate change.
Photo: Kirsten Bresciani

Ploughing or turning over the soil is a recipe for turning soil into dirt. For decades we have been encouraged to dig soils over each year, to obtain a fine ‘tilth’, but modern research has shown this actually destroys soil. ‘Dirt poor’ is a phrase for a reason. 

So how do we change our gardening practices to improve soil and sequester carbon? 

The first major step of the recipe for dark chocolate soil is going no-till (or no-dig). Many worry the soil will become compacted, making it difficult for plants to put down roots. There’s a transition phase, where the soil carbon still isn’t high, the biological life is low and yes, the soil will tend to compact. But don’t reach for the spade! Try a broadfork instead Or just any fork if that is all you have. 

The tines slot into the soil and, with the use of your own body weight, it is carefully levered up and then resettled without being inverted. Broadforks are specially designed for this with large tines and ease of use. Forking in this way doesn’t break up your soil structure or kill soil life, but it does reduce compaction.

I also use a small drill-powered auger to make holes the same size as the seedlings we are planting out and with minimal soil disturbance. 

The only time we turn over soil is when breaking new ground. Sometimes ground will need to be dug to remove stones, or break up clay and add gypsum. Or you may need to dig soil for a raised bed. But if you use the six steps described here, these soils will gradually be regenerated over the years.

One of the additional outcomes of going no-till or no-dig is a reduction in weeds. Weed seeds germinate in the top inch of soil. If you’re not disturbing it, you’re not bringing them to the surface to germinate. 

Linda Cockburn has set out six strategies we can use to improve our soil and help the planet -- you'll find them all in the latest issue of Organic Gardener, on sale now!

Nutrient-dense soil by Kirsten Bresciani

 

Other stories on our website about keeping our soil healthy:

Taking care of our planet

Biochar explained

It's elementary!

 

 

By: Linda Cockburn

First published: July 2020

Related topics

Soil & Compost, All Gardens, Sequestering carbon, healthy soil, soil carbon, nutrient-dense food, your planet, Issue 119 -- August/September 2020, Climate change