Generally speaking, the darker a soil is, the more nutrient rich it is. The darker color often indicates an increase in decomposed organic matter known as humus. Gray soils often indicate poor drainage, while red soils can indicate very poor soils.These general rules about soil colors can, however, be misleading.oil Color. The most obvious property when looking at soil is its color. The color of soil can tell scientists a lot about it. Geologist officially recognize over 170 different soil colors. Most of these are shades of black, brown, red, gray, and white.
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Adam Smith FRSA (16 June 1723 NS (5 June 1723 OS) â 17 July 1790) was a Scottish economist, philosopher and author as well as a moral philosopher, a pioneer of political economy and a key figure during the Scottish Enlightenment era.