How Different Soils Affect The Growth of a Pinto Bean



The purpose of this experiment was to see how different soils affect the growth of a pinto bean. 

I became interested in this idea when Don Jordan, my grandfather, was describing different types of soils and how they affect the growth of a plant. 

The information gained from this experiment will help produce more trees and plants faster, so they can clean the polluted air around the plant's area. Also knowing this information will help farmers produce more vegetable 


My hypothesis is that the cotton would increase the growth of a pinto bean the most. 

I base my hypothesis on Don Jordan, my grandfather, who did this experiment before me and discovered that cotton was the best material to grow pinto beans. 

Experimental Design

The constants in this study were:
  • The amount of water and light
  • Same type of plant
  • Same amount of bedding material
  • Same seed depth
  • Same planting cups
  • Same temperature
The responding variable was how tall my plant grows. 

To measure my responding variable I will use a metric ruler. Growth will be checked weekly. 


Item Description
Western Family foam cups 473ml
Western Family pinto beans 100% 907.2g
240 ml
Nursery mix (potting soil) (composted forest bark, pine needles, leaves, and fertilizer)
240 ml
Moxee dirt (regular soil from Long Sing Hop Yard)
240 ml
Blended soil (mix of 30 year aged bark mulched, top soil and sand)
Cotton balls (100%cotton) jumbo size
"Sharpie" permanent marker
240 ml measuring cups

Tap water


Label 3 cups with the words "cotton"

Label 3 cups with the words "nursery"

Label 3 cups with the words "blended"

Label 3 cups with the words "moxee"

Take a measuring cup and measure 240 ml of Nursery Mix.

Fill one cup with the words "nursery" on them with this soil.

Repeat this with the other two cups with the words "nursery" on them.

Repeat steps 5 - 7 with the cups labeled "Blended" and "Moxee", but use the appropriate soil for each labeled cup.

Spread 4 cotton balls at the bottom of each of the 3 cups marked "cotton".

Take your pinky finger and push it down into the dirt about 2 cm.

Do this in all the cups labeled "nursery", "blended", and "moxee".

Put one pinto bean in every hole. Make sure that the curve in the bean is faced upward.

Next cover the beans that are in the soils with the soil that are in the cup, do this to all the beans that are in the cups full of soil.

Put one bean on top of the cotton in the cups labeled cotton.

For each cup labeled cotton spread 4 more cotton balls over each bean.

Take 24 ml of water with the syringe and squirt the water into one cup.

Do step 16 for each seed that you planted.

Repeat steps 16 - 17 every other day for 6 weeks.

Set all plants side-by-side under 1 light source.

Rotate plants 90 degrees to the right every day.

Measure each plant at the end of each week for 6 weeks.


The original purpose of this experiment was to see how different materials affect the growth of a pinto bean. 

The results of this experiment were that a pinto bean grows best in cotton. 


My hypothesis was that the cotton would be the best material for the pinto bean to grow in. 

The results indicate that this hypothesis should be accepted. The pinto bean grew best in the cotton. 

If I were to do this experiment again I would start with many more cups of each type, so that more would grow. I would also use some soils that were not as powdery as the Moxee or the Blended soils. They compacted too much and kept the plants from growing. I would also repeat my experiment another time or two from the very beginning to make sure my results were reliable. 

Because of my results I wonder how wheat or corn would compare to beans if grown in different soils. 

Researched by --- Morgan M


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