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Sustainable techniques attempt to slow erosion through the use of cover crops in order to build organic matter in the soil. The United States loses almost 3 tons of topsoil per acre per year. [16] 1 inch (2.5 cm) of topsoil can take between 500 [17] and 1,000 years [18] to form naturally, making the rate of topsoil erosion a serious ecological ...
Soil loss tolerance for a specific soil, also known as the T value, which can be calculated with = + [1] formula, is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely.
≈ 1.102 3113 short tons-force [note 5] ≈ 70 931.64 poundals (pdl) [note 6] Long ton-force. The long ton-force is equal to the weight of one long ton.
For the cubic ton, the situation is more complex—there are different cubic tons for different materials. The 1964 Reader's Digest Great Encyclopaedic Dictionary gave the following ton-derived volumes: Timber, 40 cubic feet or 480.0 bd ft or 1.133 m 3; Stone, 16 cubic feet (0.453 m 3) Salt, 42 US bushels (1.480 m 3) Lime, 40 US bushels (1.410 m 3)
Soil consists of a solid phase of minerals and organic matter (the soil matrix), as well as a porous phase that holds gases (the soil atmosphere) and water (the soil solution). [1] [2] Accordingly, soil is a three-state system of solids, liquids, and gases. [3]
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