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Botany Science Fair Project

The Soil-Grass Connection

The Soil-Grass Connection | Science Fair Projects | STEM Projects
Does the pH level of soil affect how well grass grows? Let's find out with this science project! We'll measure the pH level of soil and then plant Kentucky bluegrass seeds in the soil. We'll measure the height of the grass after two weeks and see if the pH level of the soil had an effect on the growth of the grass.


The hypothesis is that the Kentucky bluegrass will grow best in slightly acidic soil.

Method & Materials

You will measure the pH level of soil, add soil sulfur or grounded limestone to the soil to adjust the pH level, plant Kentucky bluegrass seeds in the soil, and measure the height of the grass after two weeks.
You will need a packet of Kentucky bluegrass seeds, 5 plastic pots, enough soil for the 5 pots, a bag of soil sulfur, a bag of grounded limestone, a pH measuring kit, a soil chart, a 1m ruler, and a black marker pen.


The experiment showed that the Kentucky bluegrass was the tallest and healthiest when it was planted in soils of pH levels 6.5 and 7.0.

Why do this project?

This science project is interesting because it shows how the pH level of soil can affect the growth of grass.

Also Consider

Experiment variations to consider include using other types of grass such as Bermuda grass and carpet grass, and adding clay or sand to the soil.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

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