Soil and Hydroponics
Science Fair Projects
Ideas and Sample Projects by Grade Level

Home Experiments Photosynthesis Warning!
Primary School - Grades K-3
P=Project   E=Experiment
Aquaponics For Kids [P]
What need plants in order to grow? [P]
Does the amount of fertilizer given to a plant affect its growth? [P]
Soil Organism Science Fair Projects and Experiments
What Is Hydroponics?
Elementary School - Grades 4-6
P=Project   E=Experiment
Find out what type of grass sod grows back best after burning. [E]
Which soil absorbs the most water (soil saturation)? [E]
What is the best depth for growing bean plants in potting soil? [E]
Which works better with plants, potting soil or compost. [E] [E]
Determine how different soils affect the growth of pinto beans. [P]
Discover how much nutrients are in our soil (the amount of pH, potash, nitrogen, and phosphorus). [E]
The effect of different soil mixtures and types on plant growth [E] [P] [P] [P] [P] [P] [P] [P]
Do plants grow taller hydroponically or in soil? [P] [P]
The effect of soil moisture on plant germination and growth [P] [P] [P]
Which grasses grow best in which kind of soil pH? [P]
How Does Soil Texture Affect Water Infiltration? [E]
Soil Organism Science Fair Projects and Experiments
What Is Hydroponics?
Middle School - Grades 7-9
P=Project   E=Experiment
Compare the rate of growth and plant vigor of hydroponically grown plants to plants grown conventionally, in soil. [E]
Hydroponics: Gardening Without Soil [E]
Unique Simplified Hydroponic For Swaziland Poor Subsistence Farmers [P] [P]
How to increase traditional farming’s crop yield by low cost multi level farming with minimal effect on plants’ growth due to variable amount of sunlight? [P] [P]
Aquaponics, Hydroponics, or Soil Farming? Determining the Most Eco-Friendly Approach to Feeding the World [E]
Can common phytohormones aid the early growth of food crops even in poor soil? [P]
Determine the effects of different soil amendments on the absorption and retention rates of water in the soil. [E]
Investigated how planting depth of wheat seed affects its rate of emergence from the soil. [E]
Determine whether no-till or plow-based farming methods are best at retaining surface moisture and preventing surface runoff. [E]
How Will the Salt Percent Threshold of a Plant Affect Its Next Generation of Offspring? [E]
Measuring pH change in different soil types when acid is added. [E]
Dr. Dirt Activities [E]
Humic Acid and the Optimum Soil for Plants [E]

Determine whether or not an electric field would affect the growth of a snow pea plant. [E]
The Effect of Aeration on Compost [E]
Which method of hydroponics (bubbler method, ebb and flow, wicking) best supports plant growth? [E]
Determine the different amount of nutrients in soil, comparing potting soil and natural soil, as determined by duckweed. [E]
Measure the density and porosity of various samples of sand [E]
Use the line transect method to determine surface residue cover; identify crop effects on residue remaining after harvest; observe residue persistence (sorghum versus cotton, wheat, or soybeans) [E]
The influence of water, soil color, mulch, soil surface configuration on soil temperature [E]
The effect of particle size and water content on the ability of a soil to hold together [E]
Determine how different locations substrates affect the flow rate of water and their permeability to water and prove that drier climates increase the porosity of soil and sand substrates; therefore substrates closer to the center of the desert would have the highest flow rates. [E]
Calculated Permeability of Coarse Sand, Fine Sand, and Soil [E]
Determining the Longevity of Insecticide in Different Soil Types [E]
Determining the Ability of Various Soils to Prohibit Ground Water Contamination [E]
Analysis of soil samples for their components, ability to hold moisture, fertility and pH [P]
The Effect of the Type of Soil on the Amount of Chlorophyll in Bean Plants [E]
Determining the Effects of Nutrient Concentrations on Hydroponically Grown Lettuce [E]
Determining the effects of different nutrients on the height of hydroponically grown plants [E]
Determine how Hydroponic and Aeroponic growing systems compare to traditional soil based technology in terms of water consumption, root vigor, and growth rates. [E]
The Growth Rate of Poa pratensis in Pure Humus and Pure Humus Mixed with Sand [E]
Do plants grow better in water (hydroponics) or soil? [P] [P]
The best pH range of soil for plant growth [P] [P] [P]
The effect of soil type on the absorption of heat and water evaporation [P]
Absorption of pollutants in different soil types [P]
Soil temperature vs. seed sprouting [P]
Which soil amendment, wood ash, coffee grounds, or leaves, best enhances the development of pea and radish plants? [E]
Does organic material affect the absorbency of water in soil? [P]
The effect of Clearwater Crystals on the germination rate of mung beans [P]
The best soil mixture [E]
The evaluation of nutrient levels in orchard soils [P]
Are water storing granules (rain drops) in the soil helping to conserve water [E]
Electric conductivity as a measure of soil water content for use in watering plants. [E]
Soils as electrical systems [E]
Test the effects of salt on canola and its transgenic lines (seed germination and plant growth). [P]
Analyze the absorption of iron in collard greens in the presence of limestone. [E]
Soil Organism Science Fair Projects and Experiments
What Is Hydroponics?
High School - Grades 10-12
P=Project   E=Experiment
The Effect of Vertical Gardening on Soil Quality [E]
The Effect of Different Soil Textures upon the Permeation Rate of Water [E]
Explore Hydroponics. [P]
Determine which of four hay crops - barley, oats, vetch, or peas - is most tolerant of saline soils. [E]
The Effects of Mutualistic and Parasitic Fungus on Plant Growth and Their Soil [E]
A Study of Zinnia Growth in Four Different Soils [E]
Soil Acidity and Liming Overview [E]
What is the effect of changing particle size on the porosity of the soil? [E]
The effect of cover crop growth time on its effectiveness in enhancing plant growth [E]
The effect of burned soil on seed germination. [E]
How is soil quality affected by soil management? [E]
Soil Organism Science Fair Projects and Experiments
What Is Hydroponics?
Useful Links
Science Fair Projects Resources [R]
Citation Guides, Style Manuals, Reference [R]
Safety Resources [R] [R]
Botany Science Fair Books


Botany Project Ideas
Botany Topics Related Subjects
Seeds & Germination
Soils & Hydroponics
Soil Organisms
Colors in Botany
Weather in Botany
Plant Irrigation
Plant Nutrition
Plant Hormones
Plant Pesticides
UV Radiation Effects
Organic Agriculture
Genetically Modified Food
Plant Pollutants
Plant Cultivation
Plant Physiology
Plant Genetics
Plant Disease
Medicinal Plants
Acids in Botany
Salt & Sugar in Botany
Sun & Light
Environmental Sciences

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Last updated: September 2016
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