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Land Scaping


Aphelion - Perihelion

The word "perihelion" stems from the Ancient Greek words "peri", meaning "near", and "helios", meaning "the Sun". "Aphelion" derives from the preposition "apo", meaning "away, off, apart". (The similar words...

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Basic Principle of Landscape by Gail Hansen (University of Florida)

In Landscaping the elements of composition are the visual qualities that people see and respond to when viewing a space. Visual qualities can illicit many different emotions and feelings, and the more positive those feelings, the more likely people are to enjoy and use a space. Perhaps the most...

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Bulk Density

Bulk density is defined as the dry weight of soil per unit volume of soil. Bulk density considers both the solids and the pore space. whereas, particle density considers only the mineral solids. Figure 2.6 illustrates the difference between bulk density and particle density. http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=1130447039&topicorder=6 For our ideal soil, one-half of it is solids, and one-half is pore space. Using our example of a 1 cm3 volume, the ideal soil would have 0.5 cm3 of pore space and 0.5 cm3 of solids. Pore space filled with air weighs 0 g. Organic matter is a very small portion of the solids, so it is usually ignored in this calculation. The mineral solids would weigh 1.33 g when dry, and is determined by multiplying particle density by the volume of solids: 2.66 g/cm3 x 0.5 cm3 = 1.33 g The bulk density, then, is the dry weight of soil divided by the volume of soil: 1.33 g / 1 cm3 = 1.33 g/cm3

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