Ive just broken up a concrete shed base (around 1.5m x 3m) and want to
use the soil underneath for planting. Obvioulsy the act of breaking up
the concrete has meant that a lot of concrete rubble and dust been
thrown into the soil.
the soil was quite compacted, i removed as much of the concrete and
stones from the top, then forked it over to about depth of a garden
At this stage measuring the ph it was heavily alkaline. This could be
the natural ph, or it could be due to the concrete.
It was still quite compacted, so ive added sand to it. Also added a lot
of well rotted horse manure.
How do I go about reducing the ph, to make the soil slightly acidic?
will the concrete mixed in the soil continue to cause problems no matter
what i do? Or will adding acid to the soil balance out things and fix
also what duration of time do i need to wait before thinking of planting
many thanks for any assistance.
> use the soil underneath for planting. Obvioulsy the act of breaking up
> the concrete has meant that a lot of concrete rubble and dust been
> thrown into the soil.
> stones from the top, then forked it over to about depth of a garden
> the natural ph, or it could be due to the concrete.
> of well rotted horse manure.
> what i do? Or will adding acid to the soil balance out things and fix
> the problem?
> in it?
The standard measurement of alkalinity and acidity is known as pH. The
pH scale ranges from 0 to 14. A pH of 7 is neutral, which is neither
acid nor alkaline. Below 7 is acid and above 7 is alkaline. A pH of 5.5
is 10 times more acidic than a pH of 6.5. Conversely, a pH of 8.5 is 10
times more alkaline than a pH of 7.5.
Most horticultural plants grow best in soils with a pH between 6
(slightly acid) and 7.5 (slightly alkaline). But before attempting to
raise or lower your soil's pH, you should first conduct a soil test to
determine your current soil pH.
The pH of highly acidic soils can be raised by incorporating limestone
into the soil. Hydrated lime works quicker, but over liming is more
likely. Wood ash will also raise the soil pH and make the soil more
alkaline. Do not apply wood ash, limestone, hydrated lime, or other
liming materials to alkaline soils. Modifying a soil's pH is usually a
slow process and may require repeat treatments. It is often most
effective to use a combination of treatments. However, don't expect a
quick fix or a miracle cure.
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