GEOGRAPHY AND HISTORY

  soil PH is the measure of how acidic or alkaline soil is. the more hydrogen ions in the soil the more acidic it is. the more hydroxyl ion in the soil the more alkaline it is. Soil is a naturally occurring substance forming the thin uppermost layer of the earth's surface made by the accumulation of the weathered materials on which plants and animals live. Acidic soil can be defined as those having PH  less than 5.5 in 1:1 water extract. soil acidity affect many biological and chemical reaction The following are factors which may cause the soil to become acidic: Parent materials. Rocks like granite and rhyolite are acidic rocks and on disintegration and decomposition of these rocks results in the accumulation of acid soil materials. Organic matters. The carboxylic, enolic, and phenolic materials present in organic matter debris, dissociate releasing hydrogen ions thus contributing towards soil acidity. Climate . In heavy rainfall areas, the continuous leaching process re...

  Soil classification refers to the grouping or organization of soil into classes according to their general characteristics.  Soil are classified into two levels which are local level based on the dominant soil soil formation factors like parent rock, micro climate, vegetation, slope and drainage and global level, based on factors like climate, water and vegetation, which are dominant in the soil profile development.  Their interplay produces varying soil regimes.Lateritization, calcification, podzolization and salinization are the main soil profile forming processes under different climates.   Criteria for soil classification: There are number of factors /criteria used in classifying soils. Some of the criteria used include the following; Climatic variation in which soil can be classified as soil of humid tropics(like laterites) ir soils of cold regions like tundra soils Morphological properties of soil like depth, color, texture, structure, temperature, w...