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The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on nearby heat sources.
It is the first and the largest agricultural weather network in the United States. [2] Every 5 seconds, over 175 sensors (as of 2018) record air temperature, relative humidity and dew point , soil temperature at 8 inches, rainfall, wind speed, wind direction, insolation and leaf wetness.
The soil suborders within an order are differentiated on the basis of soil properties and horizons which depend on soil moisture and temperature. Forty-seven suborders are recognized in the United States. [6] The soil great group category is a subdivision of a suborder in which the kind and sequence of soil horizons distinguish one soil from ...
The USDA map was revised and reissued in 1990 with freshly available climate data, this time with five-degree distinctions dividing each zone into new "a" and "b" subdivisions. In 2003, the American Horticultural Society (AHS) produced a draft revised map, using temperature data collected from July 1986 to March 2002. The 2003 map placed many ...
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A typical Natchez soil profile consists of a 3-inch (7.6 cm) top soil of dark grayish brown silt loam and to 8 inches (20 cm), a subsurface of brown silt loam, a yellowish brown and dark yellowish brown silt loam subsoil to 36 inches (91 cm) and a substratum that is yellowish brown, and dark yellowish brown silt loam down to 80 inches (200 cm).
One possible way of assessing soil thermal properties is the analysis of soil temperature variations versus depth Fourier's law, Q = − λ d T / d z {\displaystyle Q=-\lambda dT/dz\,} where Q is heat flux or rate of heat transfer per unit area J·m −2 ∙s −1 or W·m −2 , λ is thermal conductivity W·m −1 ∙K −1 ; dT / dz is the ...
The North American Southern Coastal Plain is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in six U.S. states.The region stretches across the Gulf coast from eastern Louisiana to Florida, forms the majority of Florida, and forms the coastlines of Georgia and much of South Carolina.