|Soil Fertility Protocol|
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:
Type of resource:
Adobe Acrobat reader
Cost / Copyright:
For science/educational use consistent with the methodologies of the GLOBE Program.
DLESE Catalog ID: GLOBE-98
Resource contact / Creator / Publisher:
Author: University Corporation for Atmospheric Research (UCAR)
The GLOBE Program