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- Major Soil Orders/Sub-Orders, Number of Soil Series
Conserved Orders Sub-Orders No. of Series Extent (ha)
Inceptisol Aquepts 53

Udepts 99 5,579,328
Entisol Aquents 12 31,782
Fluvents 6 25,617
Orthents 24 866,461
Psamments 18 105,465


Aquults 5 39,310
Humults 10 45,545
Udults 48 1,118,276
Alfisol Aqualfs 24 439,056
Udalfs 47 420,405


Udands 41 138,832


Aquolls 1 166
Udolls 15 66,751
Histosol Hemists 1 359
Saprists 1 50
When described using the Soil Taxonomy of the USDA, soils in Korea are classified into seven Soil Orders which are then further divided into 16 Sub-Orders according to soil moisture regime. Among those seven Soil Orders, the younger soils, Entisols and Inceptisols, are dominant. Entisols are the youngest soils, followed by Inceptisols. Alfisols and Ultisols are relatively older soils. The working unit of soil classification is Soil Series. So far 405 Soil Series have been identified in Korea. Table summarized Of the areal extent of the different Soil Orders and the number of Soil Series within them.
Table shows that the occurrence of younger soils (Entisols and Inceptisols) is overwhelming. This is a result of the influence of both Korea’s unique climate, with concentrated rainfalls In summer, and rugged topography as characterized by the wide occurrence of highly-sloped Mountains. This strongly suggests that, if the soil resources are to be adequately conserved, Serious attention must be paid to development of measures to minimize the soil erosion in hilly lands.