differentiate between soil on the basis of their colours
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Answer:
Black soil ???????????????
Answer:
Soil color is produced by the minerals present and by the organic matter content. Yellow or red soil indicates the presence of oxidized ferric iron oxides.[1] Dark brown or black color in soil indicates that the soil has a high organic matter content. Wet soil will appear darker than dry soil.[1] However, 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 colors caused by oxidation are more common, as opposed to in wet (low oxygen) soils where the soil usually appears grey or greenish by the presence of reduced (ferrous) iron oxide.[1] The presence of other minerals can also affect soil color. manganese oxide causes a black color, glauconite makes the soil green, and calcite can make soil in arid regions appear white.[1]
Organic matter tends to make the soil color darker. Humus, the final stage of organic matter breakdown, is black. Throughout the stages of organic matter breakdown, the colour imparted to the soil varies from browns to black. Sodium content influences the depth of colour of organic matter and therefore the soil. Sodium causes the organic matter (humus) to disperse more readily and spread over the soil particles, making the soil look darker (blacker).[2] Soils which accumulate charcoal exhibit a black color.[3][4]
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