Composting – Part One
Compost should
always be well rotted. The wisdom of this was classically illustrated a good
few years ago at a time when my wife and I were in a folk group: we stayed
overnight in a bed and breakfast somewhere in Yorkshire, near where we’d done a
gig the night before. Unfortunately, the thin walls of the bedroom, combined
with the noisy activities of the people in the next room, led to a sleepless
night. They appeared to be working their way through the Karma Sutra and, by
the sound of it, merited a place in The Guinness Book of Records for managing
the whole lot in one go. However, the disadvantages of the place left my mind
as we were leaving, because a sign on the wall outside offered free horse
manure. Any serious gardener will recognise that my bliss on discovering this
was greater than that of the bloke in the next bedroom. The owner gave me a
large number of plastic bin bags which I filled and stored in the back of the
Renault Estate. Then we started for home.
Compost supplier |
The timing
of this event could have been better, because it coincided with the hottest day
of the year. This caused the compost to react with unnecessary vigour and my
wife threatened divorce as, even with the windows open, we levitated along the
M62 in a blue haze. Eventually I gave in, stopped the car and dumped the
compost at the edge of the hard shoulder. I often think back to how subsequent
motorists, seeing that steaming heap, would think it must have been a bloody
big horse that did it.
The point
is, compost should be well rotted before adding to the soil – the bacteria
which break it down initially need nitrogen butties to give them the energy to
work and they take them from the surrounding soil. This leaves nearby roots
short of that nutrient and the plants exhibit symptoms of deficiency, like
browning leaves. Gardeners refer to this as ‘burning’ and death can follow (of
the plant, not the gardener). Well- rotted compost doesn’t smell. It is also
black and crumbly.
With the
best will in the world, people often start a compost heap and don’t recognise
that something isn’t quite right until they end up with a towering, unstable
pile. This may be rotted at the very bottom but certainly isn’t at the top and
the only way to get the good stuff out is to risk an avalanche. The obvious
answer is to have two heaps – one covered with old carpet or plastic bags while
it breaks down and the other open for new additions.
One heap breaking down, the other being built up |
The covered
heap should be insulated as much as possible to keep heat in, while also
allowing oxygen access. It should be moist, though not too wet and there should
be a good balance of green, leafy material and woody stems. It should also be
turned occasionally, allowing the outside to get rotted.
Composting
is an inexact science and a bit like baking, in that sometimes the cake
inexplicably doesn’t rise. There’s a lot more to it , and part two will look at
the role worms sometimes play. It will also feature their sex lives. Calm down.
Kitchen waste bin next to door |
If anyone
has questions about composting, or other aspects of gardening, don’t hesitate
to ask.