Abstract
Regolith is the term we give parent material that h as been weathered. The regolith consists of weather ed bedrock near the surface including the soil layer. In the Iranian soil layer we will find: decayed par ent materials, decaying plant material, decaying animal matter (manure) along with vegetation. Results of the present study show us that methods stimulating natu ral fertility in Iran includes composting-adds humu s layer, drip irrigation-balances illuviation and elu viation in arid regions, crop rotation/ intercroppi ng-reflects natural diversity and limits gleization, add lime-r educes gleization, non-cultivation techniques-reduc es hard pan (calcification) caused by compaction and reduce pesticide use-keeps decomposers alive in humus layer.
Highlights
Eluviation is the downward movement of particles which occurs as water percolates into the soil from the surface
Humification is the term used to explain the downward movement of plant and animal waste into the soil layer through precipitation
Illuviation is the upward movement of minerals from parent materials which occurs as plants extract water from the soil
Summary
Eluviation is the downward movement of particles (decaying vegetation and animal waste) which occurs as water percolates into the soil from the surface. This is related to the amount of precipitation a region receives. Humification is the term used to explain the downward movement of plant and animal waste into the soil layer through precipitation. Illuviation is the upward movement of minerals from parent materials which occurs as plants extract water from the soil This is called evapotranspiration by geographers and is related to the region’s temperature.
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