Cabragh Wetlands is getting down to the basics at its next evening talk on Tuesday 23rd March starting at 8.00pm. The speaker is Stella Coffey, an organic farmer from Cahir; she has a BSc in Biological Sciences and her subject is “The Wonder of Soil”. This is a topic that most people will recognise as being of prime importance, especially for those interested in the quality of the food they put on the family table and in sustaining healthy biodiversity. Stella has one of the oldest organically certified herds (of Aberdeen Angus cattle) in the country. If you value the health of your garden, are starting out on a new allotment, enjoy the fruits of the Farmers’ Market or are concerned about the state of farming and use of chemicals on the land, then this is a key evening for you to attend. All are welcome and entry is free.
At the heart of any consideration about the health of our soil is that most undervalued of creatures, the humble earthworm. Though surrounded at home and Cabragh by books on wildlife, it is alarming that so many contain no indexed references to this crucial little fellow. The normal public reaction to a wriggly worm is almost invariably one of disgust, and total failure to recognize the key role played by worms in the development of life on earth. The sprawling compost heaps in my garden are a constant source of fascination. They act as breeding grounds for worms, which live in their thousands, eating their way through remains of plants and other biodegradables thrown on the heap. Material passes through the body of the worm, is cast out and gradually transformed by the action of bacteria into humus, that essential ingredient of fertile soil.
In a day a single worm will eat about a third of its bodyweight, well under a teaspoonful. Insignificant on one level, but on another perhaps the most important day-to-day activity on the planet. Every ounce of organic vegetable mould has passed through the body of worms many, many times. Worms alter the composition of the soil, improving its ability to absorb and contain moisture, changing the balance of microorganisms and nutrients. Through these processes they determine the ability of soil to grow particular kinds of plants, thus playing a key role in deciding which plants grow above the surface of the earth, and in turn influencing the type of insects, mammals and birds that can evolve and live in any area.
The worm moves through the ground, eating tiny particles of decaying organic material, which it ingests with a few grains of clay, creating a permanent burrow. At night it comes to the surface, leaves a few milligrams of castings and then searches for new material (leaves, grass, anything organic) to drag underground and break up. As well as acting as a miniscule plough, worms will, piece by tiny piece, shape the landscape above the surface, burying items left on the ground. That key you dropped, those stones you flung in a corner of the garden, that path you laid, all will be buried by the action of worms. Given enough time and enough worms, collapsed houses, towns and whole civilizations will disappear under the ground. Is it an illusion that things sink below the surface? Surely worms are causing the level of the surface to rise? Archaeologists having to dig down several feet to find their lost treasures are surely clear evidence of the unlimited power of the humble earthworm to shape the landscape above.
Charles Darwin spent his last years studying and writing about worms. This most humble of creatures has a strong case to be considered the most important and indispensable creature on the planet. There can be no doubt that it plays a far more important role in sustaining life on earth than humans. Come to Cabragh Wetlands on Tuesday 23rd to reflect more on “The Wonder of Soil”.
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