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In both the World Reference Base for Soil Resources (WRB) [1] and the USDA soil taxonomy, [2] a Histosol is a soil consisting primarily of organic materials.They are defined as having 40 centimetres (16 in) or more of organic soil material starting within 40 cm from the soil surface.
Muck soils are defined by the USDA NRCS as sapric organic soils that are saturated more than 30 cumulative days in normal years or are artificially drained. [6] An example would be a soil made up primarily of humus from drained swampland .
Our example soil has the following characteristics: Field characteristics (described according to Annex 1 of the WRB Manual): A soil developed from loess shows a marked clay increase in around 60 cm depth and clay coatings in the clay-richer horizon. According to the landscape setting, we presume that high-activity clays dominate.
This soils usually contain high organic matter content, exceeding 75% with dry low bulk density around 0.2 mg/m 3 (0.0 gr/cu ft). [ 4 ] Areas of tropical peat are found mostly in South America (about 46% by area) [ 5 ] although they are also found in Africa, Central America, Asia and elsewhere around the tropics.
Tomiko Itooka, a 116-year-old Japanese woman who became the oldest living person in August 2024, died on Dec. 29, 2024, according to Guinness World Records.
After nearly derailing a spending bill and forcing a government shutdown last month, President-elect Donald Trump continues to shake up legislative business on Capitol Hill, offering shifting ...
Over a 45-years span — between 1975 and 2020 — improvements in cancer screenings and prevention strategies have reduced deaths from five common cancers more than any advances in treatments ...
Soil has a crucial function in the global carbon cycle, with the global soil carbon pool estimated to be 2,500 gigatons. This is 3.3 times the amount of the atmospheric pool at 750 gigatons and 4.5 times the biotic pool at 560 gigatons.