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Rainfall also affects soil pH. Water passing through the soil leaches basic nutrients such as calcium and magnesium from the soil. They are replaced by acidic elements such as aluminum and iron. For this reason, soils formed under high rainfall conditions are more acidic than those formed under arid (dry) conditions.
clay or a certain dirt. No not clay or certain dirt at all- Soil is red because of the same compound that causes rust to be red, oxidised iron (most common formula- Fe2O3). â¦If the soil has nutrients like Iron and other elements that oxidise it will be dark. A soil with just Iron and not many other nutrients will usually be a lighter red.