Vernier Software and Technology
Vernier Software & Technology

Soil pH

Figure from experiment 8 from Agricultural Science with Vernier


When you think of pH, you probably think of liquid acids and bases. But soil can be acidic or basic, too. Soil pH, sometimes referred to as soil acidity, can be expressed using the pH scale. The pH scale ranges from 0 to 14. Soils with pH above 7 are basic or sweet. Soils with pH below 7 are acidic or sour. A soil with a pH of 7 is neither acidic nor basic, but is neutral.

The pH of soil is an important factor in determining which plants will grow because it controls which nutrients are available for the plants to use. Three primary plant nutrients – nitrogen, phosphorus, and potassium – are required for healthy plant growth. Because plants need them in large quantities, they are called macronutrients. They are the main ingredients of most fertilizers that farmers and gardeners add to their soil. Other nutrients such as iron and manganese are also needed by plants, but only in very small amounts. These nutrients are called micronutrients.

The availability of these nutrients depends not only on the amount but also on the form that is present, on the rate they are released from the soil, and on the pH of the soil. In general, macronutrients are more available in soil with high pH and micronutrients are more available in soil with low pH.


In this experiment, you will

  • Use a pH Sensor to measure the pH of soil samples.
  • Identify any nutritional problems plants would have in that soil.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Agricultural Science with Vernier »

Agricultural Science with Vernier

See other experiments from the lab book.

1Introduction to Data Collection
2Acids and Bases
3Diffusion through Membranes
4Conducting Solutions
6Respiration of Sugars by Yeast
7Reflection and Absorption of Light
8Soil pH
9Soil Salinity
10Soil Temperature
11Soil Moisture
12APhotosynthesis and Respiration (CO2)
12BPhotosynthesis and Respiration (O2)
12CPhotosynthesis and Respiration (CO2 and O2)
14ACell Respiration (CO2)
14BCell Respiration (O2)
14CCell Respiration (CO2 and O2)
15The Greenhouse Effect
16Energy in Food
17AEnzyme Action: Testing Catalase Activity
17BEnzyme Action: Testing Catalase Activity
18ALactase Action
18BLactase Action
19Oxygen Gas and Human Respiration
20Biochemical Oxygen Demand
21Animal Temperature
22Lemon "Juice"
23Ohm's Law
24Energy Content of Fuels
25Photovoltaic Cells
26Wind Power
27Watershed Testing
28Interdependence of Plants and Animals
29Biodiversity and Ecosystems

Experiment 8 from Agricultural Science with Vernier Lab Book

<em>Agricultural Science with Vernier</em> book cover

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