Testing Garden Soil (NPK)

0
Published October 24, 2012 | Updated November 6, 2012
Subject: Science
Season: Winter, Spring, Summer, Fall
Place of Learning: Garden Classrooms
Resource Type: Lessons
Grade Level: Grade 5, Grade 6, Grade 7, Grade 8
Uploaded by:
Rick

In this lesson students will learn how to test their garden soil for nitrogen, phosphorous, and potash (potassium).

 

Objectives

Students will be able to:

  • Understand how to read the N-P-K number on a bag of fertilizer.
  • Explain that nitrogen, phosphorous, and potash are important compounds for plant and fruit growth.
  • Demonstrate how to use a home N-P-K test kit.
Materials
  • Soil sample from garden.
  • Home soil test kits (can be found inexpensively online).
  • Fertilizer samples that have a N-P-K number.
Preparation
  • Have examples of fertilizers with N-P-K numbers displayed.
  • Have soil sample ready or have students collect soil samples.
  • Familiraize yourself with your particular soil test kit.
Procedures

At the Opening Circle

  • Show students the N-P-K number on a bag of fertilizer and explain that these numbers stand for the percentages of nitrogen, phosphorous, and potash.
  • Explain to students the function of N-P-K (nitrogen helps plant foliage, phosphorous helps roots and flowers grow, potash is important for plant health.
  • Show students test kits and explain how to use them.
  • Divide students into three groups, each group will test either nitrogen, phosphorous, or potash.

At the work stations

  • Have students do soil test according to directions of your particular test kit.

At the closing circle

  • Have students share their results with the rest of the class.
  • Discuss methods to amend the soil naturally. Explain that bags of chemical fertilizers often add these elements without contributing to overall soil tilth and that there are other important elements in soil. Explain that compost, worm castings, certain manures, bonemeal, etc.. are natural healthy ways to amend your soil.

Other Content From Rick

In this lesson, students search for different temperatures in the garden.

Area: Garden Classrooms
Type: Lessons
Rating:
0

In this lesson students will learn about the different parts of a bean by dissecting fava beans.

 

Area: Garden Classrooms, Academic Classrooms
Type: Lessons
Rating:
0

In this lesson, students use magnifying glasses to explore different examples of soils from the garden while learning that soil is full of living organisms while dirt is lifeless decompossed rocks and minerals.

Area: Garden Classrooms
Type: Lessons
Rating:
5