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Soil Fertility Protocol DLESE Reviewed Collection
The purpose of this resource is to measure the amounts of nitrogen, phosphorous and potassium in each horizon in a soil profile. Using a NPK test kit, students mix a dry, sieved soil sample into a solution and chemically extract the N, P, and K as nitrate, phosphate, and potassium. The N, P, and K amounts in the sample are determined by comparing the solution to a color chart. Students describe the N, P, K amounts as high, medium, low, or none. These measurements are conducted three times for each horizon.
Intended for grade levels:
  • Middle (6-8)
  • High (9-12)
Type of resource:
  • For the classroom:
    • Classroom activity
    • Field activity
Subject:
  • Agricultural science
  • Soil science
Technical requirements:
Adobe Acrobat reader
Cost / Copyright:
No cost
For science/educational use consistent with the methodologies of the GLOBE Program.
DLESE Catalog ID: GLOBE-98
Educational standards:
  • National Science Education Standards (NSES):
    • 5-8:
      • Unifying concepts and processes:
        • Change, constancy, and measurement
        • Form and function
      • A - Science as inquiry:
        • Abilities necessary to do scientific inquiry
        • Understanding about scientific inquiry
      • F - Science in personal / social perspectives:
        • Populations, resources, environments
    • 9-12:
      • Unifying concepts and processes:
        • Change, constancy, and measurement
        • Form and function
      • A - Science as inquiry:
        • Abilities necessary to do scientific inquiry
        • Understandings about scientific inquiry
      • D - Earth and space science:
        • Geochemical cycles
      • F - Science in personal / social perspectives:
        • Environmental quality
        • Natural resources
  • National Geography Standards:
    • Environment and society:
      • How human actions modify the physical env.
      • The changes that occur in the meaning, use, distribution, and importance of resources
Resource contact / Creator / Publisher:
Author: University Corporation for Atmospheric Research (UCAR)
The GLOBE Program
http://www.globe.gov/