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Geosmin (/ dʒ i ˈ ɒ z m ɪ n / jee-OZ-min) is an irregular sesquiterpenoid with a distinct earthy or musty odor, which most people can easily smell. The geosmin odor detection threshold in humans is very low, ranging from 0.006 to 0.01 micrograms per liter in water. [1]
Terra preta zones are generally surrounded by terra comum ([ˈtɛʁɐ koˈmũ, ku-]), or "common soil"; these are infertile soils, mainly acrisols, [6] but also ferralsols and arenosols. [7] Deforested arable soils in the Amazon are productive for a short period of time before their nutrients are consumed or leached away by rain or flooding.
A percolation test consists of digging one or more holes in the soil of the proposed leach field to a specified depth, presoaking the holes by maintaining a high water level in the holes, then running the test by filling the holes to a specific level and timing the drop of the water level as the water percolates into the surrounding soil.
Soil and water being splashed by a raindrop. Petrichor (/ ˈ p ɛ t r ɪ k ɔːr / PET-ri-kor) [1] is the earthy scent produced when rain falls on dry soil. The word was coined by Isabel Joy Bear and Richard Grenfell Thomas (in Nature of Argillaceous Odour.
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The 1981 movie Polyester, directed, produced, and written by John Waters, was released featuring a gimmick called "Odorama", whereby viewers could smell what they saw on screen through scratch and sniff cards. The Odorama gimmick was also used for the 2009 Sydney Underground Film Festival screening of Water's 1972 cult classic Pink Flamingos.
Gumbo soil is typically defined by the overwhelming presence of very fine particles of clay, but often has small amounts of sand and/or organic material. [1]Although gumbo soils are exceptional at water retention, they can be difficult to farm, as precipitation will turn gumbo into a unique muddy mess that is challenging to work using large commercial farming equipment.