|Why do plants need soil?
|Question Date: 2017-05-18|
Just like how we eat food for energy, plants
need soil because the soil itself have nutrients
that help plants survive, such as
nitrogen and potassium that can only be found from
the soil. If you dig out the soil and look at
the bottom of trees and many plants, you
can see a lot of roots. These roots help the
plants and tree not only get necessary nutrients,
but also retain wate that was
dropped by rain or streams of water. Also, soil
can help plants stay in one place and not get
Actually, plants don't always need soil. A lot of
algae and seaweeds grow in water without soil.
There's also a kind of farming or gardening called
'hydroponics,' where plants are grown in
water with minerals and nutrients in it. You can
read about it here:
Soil provides nutrients and minerals for
plants. Soil keeps the plants in place, so they
don't blow away in the wind. Soil keeps the water
close to the roots, so the plants don't dry up in
the sun. Maybe you can think of other uses
Plants' bodies are made up mainly of seven
elements: hydrogen, carbon, nitrogen, oxygen,
magnesium, phosphorous, and sulfur. Of these,
carbon and oxygen the plant can get from the air,
and hydrogen the plant can get from the water. The
other four the plant cannot get from either the
air or the water, and so needs to get it from the
Note: the air is actually mostly
nitrogen, but the chemical form that the nitrogen
is in is a a form that plants cannot use. There
are bacteria that can use that, and that's how
nitrogen gets into the soil in the first place,
but the plants still need the soil.
Plants, like any other organism need
nutrients so that they can grow. While we take
in nutrients through our mouths by eating food and
water, plants don’t have mouths. What they do
have, is they have roots that extend deep into the
soil. The soil actually has a lot of nutrients in
it because as organisms die and decompose, they
become part of the dirt. From here, plants are
able to absorb the good parts from the soil in the
same way that we absorb the good parts from the
food we eat. Essentially, plants use the soil
as a medium to get food and water to their roots
and then use that food to grow.
Soil is very important for plants. Soil
holds the plants up and gives them structure.
The roots of a plant grow downwards and hold on so
that they can grow big and sturdy. Soil also
supplies the plants with water and nutrients
which help it grow, just like us!
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