Knowledge Title: Soil classification Other Title: soil classification Knowledge Content:  An analogy and distinction between soils within a certain range (as large as the world or as small as an agricultural production unit) based on the similarities and differences between soil formation conditions, soil formation processes, profile patterns and soil properties. Soils are generally classified as several classification units, forming a classification system that reflects the academic relationship between soils.  Soil classification is the basis of soil survey, mapping and soil resource evaluation. It can not only reflect the relative position of soil in formation and geographical distribution, but also provide scientific basis for rational utilization and improvement of soil and give full play to soil fertility potential. The perfection of soil classification is an important sign of the level of soil scientific development.  A brief history China has been documented in soil classification as early as BC.……

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