Comparsion of different soils evolution based on Argillic horizon development

Assessing of soil genetically evolution is very important because the large number of management decisions depend on soil classification and its evolution rate. In this regards, evaluation of soils clay is one of the best indices for soil evolution. This study was carried out in four regions of Maraghe, Tabriz, Arasbaran and Amol by study of Alfisols, Mollisols and Aridisols with argillic horizon. The main aim of study was evaluation of soil evolution using quantitative and semi quantitative methods of CAI, MISODI and MISECA indices besides previous assessment of their evolution according to soil classification and micromorphological observations. Results revealed general description of soils evolution by CAI, while micromorphological indices especially MISODI describe accurate and rational studied soils evolution arrangement. The reason for accurate and rational description by MISODI index was the high number and precise parameters that according to this index evoluation rate increase in the studied soils of Mollisols, Alfisols and Aridisols orders respectively. Generally it can be concluded that regardless of achievable physical and chemical indices of soil evolution which may have errors and are private for each soils, quantification of soil microscopic studies can be the best way for soil evolution evaluating and determining their taxonomic distance.