Vernier Software and Technology
Vernier Software & Technology

Soil pH

Figure from experiment 10 from Investigating Environmental Science through Inquiry

Introduction

When you think of pH, you probably think of acidic and basic solutions. 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.

Objectives

In the Preliminary Activity, you will gain experience using a pH Sensor and learn soil pH measuring technique as you determine the pH of a soil sample.

After completing the Preliminary Activity, you will first use reference sources to find out more about soil pH before you choose and investigate a researchable question dealing with soil pH.

Sensors and Equipment

This investigation 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 Investigating Environmental Science through Inquiry »

Investigation 10 from Investigating Environmental Science through Inquiry Lab Book

<em>Investigating Environmental Science through Inquiry</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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