This is a device designed to measure the temperature of soil in a plant's environment. It can be used to monitor the temperature of the soil to ensure that the plant is receiving the optimal amount of heat for its growth and development. The device is easy to install and use, and it can
From Wikipedia
USDA soil taxonomy (ST), developed by the United States Department of Agriculture and the National Cooperative Soil Survey, provides an elaborate classification of soil types according to several parameters and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series. The classification was originally developed by Guy Donald Smith, former director of the U.S. Department of Agriculture's soil survey investigations.