By Nathan Pendergraft
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The experiment was comparing the soils to see which bean plant
would grow the best in quantity or size.
The soils were top soil, potting soil, and peat moss soil.
The ingredients of the potting soil is a blend of Canadian
sphagnum peat moss, with pine bark, horticultural grade perlite,
dolomite lime and a wetting agent. The mix of peat moss is
Mosser Lee sphagnum moss , mix of bark, and roots.
They were put in trays that had ten cups in them. The lima bean
seed were put into each cup.
The grow light lamp was set up and the plants got twenty-four
hours of sunlight.
The lima beans were light green in coloring. They were measured
at the end of each week. They were measured 4 weeks. It was
found that Potting soil had most in quantity and came in second
on average height.
Potting soil grew the lima bean the best.
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During the research on the project I found
many sources about it.
One I found out that plants are able to grow
better in certain types of soils.
They grow better when they are in certain
amount of sunlight.
They can produce better when they are in
soils that have rich nutrients.
Different soils can receive nutrients from
decomposing organisms.
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The information that was found led it to this
hypothesis. If the potting soil has the most
nutrients added to it then it will grow the lima
bean plant the best in quantity and in height.
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Materials:
▪ Potting Soil
▪ Peat moss Soil
▪ (Top)Earth Soil
▪ Egg carton
▪ Bean Plant
▪ Water
▪ Sunlight
Variables:
 Control Variable: 1 cup of soil, ¼ Cup of water, A grow light, same size cup
 Independent Variable: Soil
 Dependent Variable: Plant Growth
 Constant: ¼ cup of water, 1 cup of soil, size of cup
Week four
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Procedure:
First you put 30 bean seeds in the cups.
Then you fill the cups with soil. Having 10
cups each for each soil.
Fill this to ¾ of the cup. Then set them in an
area to put under a Grow Light.
After that you will water all 30 plants with
¼ cup of water for each cup. You will water
this everyday.
This will last for about 3-4 weeks. You will
water this for that time.
Record results as the seeds grow. Record
the measurements of the height of the
plant and if they look healthy, for example
the color of the bean plant.
Do a Check at each week, for example soil 1
plants measured 2 inches in week one, and
then week 2 and so on.
Week 3
Week 2
Week 1
Week 1
Potting Soil
Average
Height(Cm)
Week 1
3.5cm
Top Soil
Peat Moss
Average
Soil
Height (Cm) Average
Height (Cm)
5cm
4cm
Plant Growth in Soils
70
P
l
a
n
t
68
66
65
60
51
Week 2
16cm
20cm
18cm
48
H 50
i
e
g
t 40
h
43
Week 1
Week 2
Week 3
Week 3
43cm
51cm
48cm
30
Week 4
20
Week 4
66cm
65cm
68cm
16
10
3.5
20
18
4
5
0
Potting Soil
Peat Moss Soil
Top Soil
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My hypothesis was supported because the
potting soil did turn out to be best in quantity
and it was in height.
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I would like to thank my parents for buying
the things I needed for this project.