The reason why it is called ‘topsoil’ is because it is on the uppermost layer of the dirt that you work with when gardening or seeding. The highest concentration of microorganisms and organic matter can be found in these top two to eight inches of soil; however, the amount of organic matter varies in different soil types. | Meaning, pronunciation, translations and examples Topsoil is the upper layer of native soil. Definition of topsoil in the Definitions.net dictionary. Therefore, in terms of growing plants and the like, topsoil is … According to topsoil definition provided by expert environmentalists the layer of soil on the earth from 2 to 7 inches deep which contains large amount of microorganisms and organic matters in abundance can be called as topsoil. (the soil which forms) the top layer of ground in which plants grow 2. the layer of earth in…. Topsoil is defined as the 2-8 inches of soil on the surface of the Earth. Topsoil definition: Topsoil is the layer of soil nearest the surface of the ground . More amounts of topsoil can mean many things, including microbial diversity, greater reduction in chemical additive use by farmers, and increased ability to hold water. In the context of viticulture, top soil refers to the top 2 to 8 inches of soil in the vineyard. Learn more. Definition - What does Topsoil mean? • TOPSOIL (noun) The noun TOPSOIL has 1 sense:. Dictionary entry overview: What does topsoil mean? The depth of topsoil is measured from the ground surface to the first layer of densely packed soil known as the subsoil. Topsoil, as the name would indicate, is a product that has been taken from the top few inches of the earth. ‘First, don't overmix the organic, topsoil and deeper layers, as this can bury organic matter too deeply.’ ‘Sprinkling a thin layer of topsoil or compost over the lawn will also help.’ ‘The thin layer of topsoil is constantly thawing and refreezing during the summer, and this makes any plant growth very difficult.’ 1. the layer of soil on the surface Familiarity information: TOPSOIL used as a noun is very rare. topsoil meaning: 1. It can be used for many purposes , including building gardens, improving drainage and fixing damaged lawns. While there is no standard topsoil definition based on composition, bit standard topsoil sold in bulk is usually made from the top 5 to inches of the earth's soil. topsoil meaning, definition, what is topsoil: the upper level of soil in which most pl...: Learn more. 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