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Soil colour
This document discusses soil color from the University of Salahaddin's College of Education Environmental Science department. It defines soil color, discusses the causes and classification of soil color. Soil color is influenced by organic matter, iron, aluminum, and silicate content and indicates environmental conditions during soil formation. Color can identify general properties and chemical processes in soil, ranging from gray to black, white, reds, browns, and yellows. Wet soil appears darker than dry soil and water affects oxidation rates influencing color.
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Soil colour
- 1. University of Salahaddin College of Education Environmental Science department 1 Halala Rahman Qadir M.Sc. Plant physiology
- 2. The objectives are: Definition of soil colour 2 Causes of soil colour Classification of soil colour Causes of soil colour
- 3. Definition of Soilcolour Soil color: is one property that can be used to describe horizonation and soil morphology. The change in soil color with depth is directly related to a variety of processes that are occurring in the soil The soil color does not effect the behavior of the soils, but provides insights into environmental conditions, formation processes, and other influences on the soil. Used is used in classifying soils. 3
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- 5. Soil colour Soilcolor: does not affect the behavior and use of soil; however, it can indicate the composition of the soil and give clues to the conditions that the soil is subjected to. Soil can exhibit a wide range of colour; gray, black, white, reds, browns, yellows and under the right conditions green. 5
- 6. Definition of vasculartissue Vascular tissue: is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. 6 Important/significant foundation soil physical properties •Color •Redoximorphic features • Texture •Structure •Consistence •Coarse fragments •Reaction
- 7. Classification of Soilcolour Soil colour is usually due to 3 main pigments: •black—from organic matter •red—from iron and aluminium oxides •white—from silicates and salt. Colour can be a useful indicator of some of the general properties of a soil, as well as some of the chemical processes that are occurring beneath the surface. 7
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- 10. Causes of solcolour Soil color is influenced by the amount of proteins present in the soil. • Yellow or red soil indicates the presence of iron oxides. • Dark brown or black colour in soil indicates that the soil has a high organic matter content. •Wet soil will appear darker than dry soil. • The presence of water also affects soil color by affecting the oxidation rate. Soil that has a high water content will have less air in the soil, specifically less oxygen. In well drained (and therefore oxygen rich soils) red and brown colours caused by oxidation are more common, as opposed to in wet (low oxygen) soils where the soil usually appears grey. 10
- 11. 11 Types ofvascular tissue-xylem
- 12. Soil Coloring MaterialChemical Composition Color Manganese Mn02 Purplish Black Hematite Fe203 Red Geothite FeOOH Yellow Hydrated Ferric Oxide Fe(OH)3*nH20 Red Brown Calcite CaC03 Whitish Glauconite KMg(Fe,Al)(SiO3)6.3H2O Greenish
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