Rain factor

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rain factor

A coefficient designed to measure the combined effect of temperature and moisture on the formation of soil humus.

It is obtained by dividing the annual rainfall (mm) by the mean annual temperature (°C). When the rain factor is below 50, salty and sandy soils form; above this value the soil type passes through laterite, brown earth, and black earth to earth humus and leached soil with the rain factor above 160.

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