Cultivation degrades organic
matter
Digging and consequent cultivation increases the oxidation of organic
matter to carbon dioxide and water. To be fair, digging is much less damaging
than rotavation. An undisturbed soil in nature has a structure networked with
channels made by roots and worms. Interconnected air spaces continue all the
way down into the subsoil and aid aeration and drainage. On a smaller scale,
soil structure is made up of soil particles bound together by organic matter. All this is smashed apart by cultivation. Air has immediate access to
the loosened soil, speeding the decay of organic matter.
As an eccentric lecturer in soil management I once did a ‘trial’. For
twenty years, I refused to accept organic matter from any external source for
my undug allotment. I did, however, recycle all the organic matter that the
plot produced. The plot became black with
organic matter. I took a sample to college for analysis. The level of organic
matter was off the scale.
You will shudder to learn how I recycle my broad bean tops. They are shredded with my hedge trimmer and left for the worms! |
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