What
does it mean to "save the topsoil?" Dirt is just dirt, right? When some
washes away in the rain, there's just more underneath, isn't there?
Isn't the earth
made of dirt?
The dirt beneath
your feet is only the top layer — maybe only one or two feet thick.
Maybe not even that much. It is made mostly of small particles of rock,
some clay, and dead plant material. And if it is healthy soil, it also
contains an astounding amount of life. One handful of healthy soil
contains more living organisms than there are people on earth. These
living things include worms, bacteria, very small insects, and fungi.
Underneath
the topsoil is subsoil, also about a foot or two deep. It has less life
in it, and some plant roots don't penetrate into it. Beneath that is
bedrock.
It takes a long time for topsoil to build up
into something that plants thrive on. Erosion naturally and inevitably
removes topsoil by wind when it's dry and by washing some away some
topsoil when it rains. If the topsoil is building up — by falling leaves
decomposing and feeding the microorganisms, and by the action of plant
roots feeding fungi, which feeds other soil organisms, and by
earthworms
and other creatures — if the topsoil is building up at the same rate as
soil is eroding, then everything is fine. But if soil is eroding faster
than it's being built, eventually plants won't grow very well on it.
Have
you seen what the Middle East looks like? When you see the vast areas
of bare ground, you're seeing what happens when erosion happened faster
than topsoil accumulation. Eventually nothing can grow in it. The
topsoil is gone and the subsoil is gone. This is not unique to the
Middle East, but that's where agriculture originated, so they got a
"head start."
The same thing is happening everywhere.
"Around the globe," says Judith Schwartz, "we're losing topsoil
somewhere between ten times (in the United States) and forty times
(China and India) faster than we're generating it..."
When
a field is plowed (and before crops have taken root) it is vulnerable
to erosion. If it dries out and the wind starts blowing, some of that
topsoil blows away. If it rains, some of that topsoil washes away. When
it rains and you see a river that looks muddy, you are usually looking
at topsoil on its way to the ocean.
When grasslands
are grazed unnaturally, bare ground starts to show. That bare ground can
also blow away in the wind or wash away in the rain. Much of the living
organisms in the soil die off, releasing their carbon back into the
air.
All of us have a stake in the health of soil.
Topsoil is a thin barrier between survival and starvation. History is a
broken record playing the same thing over and over again: Agriculture in
fresh land is productive, and the human population grows. Farming
practices expose and exhaust the soil, causing diminishing agricultural
returns, which eventually causes people to move somewhere else and do it
all over again. Read the book,
Dirt: The Erosion of Civilization for the history of the world as seen through the ultimate driving force behind most historical events — soil erosion.
And
here we are in the present, still doing the same thing. The population
is growing and we're losing topsoil. But we are all out of new places to
move.
One long-term solution to this is to reduce the
human population. Luckily, the best way to achieve that is something
that ought to be done anyway: Make sure women everywhere have human
rights.
But in the meantime, we need to restore our precious topsoil. Holistic Planned Grazing does exactly that.
Here's how it works.
Adam Khan is the author of Self-Reliance, Translated and Principles For Personal Growth. Follow his podcast, The Adam Bomb.