Discuss about the relation between soil colour & soil moisture

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soil moisture or soil water is the water present within the interstitial spaces in between soil particles held together by matrix potential.The minerals are present in colloidal state where soil moisture plays the role of dispersion medium.the hydration layer prevents the colloids from coming in contact with each other & settling down.Soil moisture in it's purest form is optically clear & transparent.A colloidal solution where soil moisture is the dispersion medium,the colloidal particles will scatter the light falling on it's surface & the scattering effect of the colloidal solution is called Tyndal Effect. name after discoverer J.Tyndal.the intensity of the scattered light depends upon the difference of the refractive index of dispersion medium & the suspended particles.
                                                    soil colour is based on 3 variables:
a)Hue-the dominant spectral or "rainbow" colour (Blue,Green,yellow etc.).
b)Value-the relative blackness or whiteness,the amount of reflected light.
c)Chroma-purity of the 'colour' which increases as greyness decreases.
            For eg.-soil organic matter make soil dark coloured & improve the water containing capacity of soil,especially when the soil mineral matter is coarse textured.Changes in colour influences the thermal absorption & radiation characteristics of a soil.A darker soil cools faster at night than a light coloured soil at the same temperature.It will heat up more rapidly during the day also.Bluish,greyish & greenish subsoils(gleying) wth or without mottles,indicate longer periods each year of waterlogged conditions & inadequate aeration.Reducing reactions are the most probable in fully/partially waterlogged soils.
saline soils found in soil moisture deficient regions are white in colour.this holds true for soils rich in carbonate.this is because soil moisture is present in the soil as H+ & OH- ions which readily reacts with mineral & organic matters & coagulates,this depends on whether minerals reacts with H+ or OH- ions.
In conclusion,it can be said that other factors are also involved in colour determination of soil & also on the product formed by chemical reaction

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