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. Facts to Know About Topsoil. Topsoil is defined as the 2-8 inches of soil on the surface of the Earth. At this level, there are many more nutrients and bits of organic material than would be found at a deeper depth. Facts to Know About Topsoil. topsoil meaning, definition, what is topsoil: the upper level of soil in which most pl...: Learn more. | Meaning, pronunciation, translations and examples Learn more. 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 meaning: 1. Definition - What does Topsoil mean? Therefore, in terms of growing plants and the like, topsoil is … It can be used for many purposes , including building gardens, improving drainage and fixing damaged lawns. Information and translations of topsoil in the most comprehensive dictionary definitions resource on the web. 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. • TOPSOIL (noun) The noun TOPSOIL has 1 sense:. Definition - What does Topsoil mean? Topsoil is the upper layer of native soil. Topsoil definition: Topsoil is the layer of soil nearest the surface of the ground . ‘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.’ 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. 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. 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. In the context of viticulture, top soil refers to the top 2 to 8 inches of soil in the vineyard. 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