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General Environmental Science Science Fair Project

Decomposing Plastic Spoons

Decomposing Plastic Spoons | Science Fair Projects | STEM Projects
We're going to find out if biodegradable spoons can decompose in soil in just 30 days. We'll measure the weight of the spoons before and after the 30 days to see how much decomposition has occurred.


The hypothesis is that biodegradable spoons lose some of their weight as quickly as within 30 days after being kept in soil.

Method & Materials

You will mark 10 pieces of each type of spoon, measure the weight of each type of spoon, plant the spoons in soil, and measure the weight of the spoons after 30 days.
You will need 10 pieces of corn starch-based bio-degradable spoons, 10 pieces of wheat-based bio-degradable spoons, 10 pieces of plastic spoons, a digital weighing scale, soil, water, and a black marker pen.


The results showed that the weight of the corn starch based spoon and wheat based spoon had reduced after 30 days in the soil but the weight of the plastic spoon remained the same. This proves that biodegradable spoons can decompose in soil in just 30 days.

Why do this project?

This science project is interesting because it shows how biodegradable spoons can decompose in soil in just 30 days, which is much faster than regular plastic spoons.

Also Consider

Consider repeating the experiment with different environments for decomposition, such as by immersing the plastic in lake water or vegetable oil. For a shorter project, you can set up several spoons and take them out on different days to see how much they have decomposed. You could also try repeating the science project with other types or brands of biodegradable spoons, or by introducing specific species of bacteria into the soil.

Full project details

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

Related videos

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
9-Month Long Biodegradable Spoon Experiment: Observing Spoon Decomposition in Different Liquids!" It is crucial to avoid touching the liquids, particularly the drain cleaner, after the lengthy 9-month incubation period. Let's see what happens to the biodegradable spudware spoons!
2-year Long Biodegradable Spoon Experiment: The spudware spoons proved their durability by withstanding the harsh effects of drain cleaner for almost 2 years! The spoon that decomposed the most in compost showed promise for decomposing biodegradable utensils in soil. However, a major issue with the experiment in this video is that limited oxygen inside the ziplock bags may have hindered decomposition, emphasizing the need to consider optimal conditions for decomposition.
This remarkable innovation offers a sustainable solution to single-use plastic utensils while also providing a unique edible experience.
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