Protocol eTraining Modules

Learn how to construct and install a frost tube. Review the steps for using this device to determine how deep the soil freezes (known as the frost depth) during the cold months.

Learn how to collect soil samples from the field using a container with a known volume. Then, build on soil analysis procedures from the Soil Moisture (Gravimetric) and Soil Characterization protocols to determine the mass and volume of dry soil, as well as the mass and volume of rocks. Use these values to calculate "soil bulk density," which is a measure of how tightly packed the soil is.

This module provides step-by-step instructions on how to characterize soil by its structure, color, consistency, texture and abundance of roots, rocks and carbonates. First, learn how to select, expose and define a Soil Characterization protocol study site. Then, review how field samples of soil are collected and characterized.

Learn how to build your own soil infiltrometer using metal rings and determine the rate at which water soaks into the ground as a function of time. Build upon your knowledge of gravimetric soil moisture collection and analysis techniques to determine the saturated soil water content.

Learn how to collect soil samples from the field, then determine the soil water content by calculating the difference between the wet sample mass and the dry sample mass. You will be able to relate soil moisture measurement to the physical and chemical properties of the soil. In this instance, gravimetric means determining the amount of moisture in the soil by weight.

Take your soil moisture investigation techniques to the next level! Build upon your knowledge of gravimetric soil moisture and bulk density procedures to also account for volumetric soil moisture content. Plan your investigation based on when NASA’s Soil Moisture Active Passive (SMAP) satellite will overfly your soil investigation site.