Soil texture and the Bienz Soil Chart
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The twelve principal soil textures used in The Compleat Botanica come from the Bienz Soil Chart published by the United States Department of Agriculture.



particles more than 0.05 mm in diameter


particles between 0.002 mm and 0.05 mm in diameter


particles less than 0.002 mm in diameter


equal amounts of sand, silt, and clay particles along with humus, water, and air.

In addition to the twelve Bienz soil textures, many horticulture and garden books use a less precise set of soil types. These are listed as numbers 20 through 31 in the chart below.

See also

   The RHS color chart numbering system

   USDA plant hardiness zone map


Last reviewed March 25, 2004   


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