Tonka soil and landscape
The Tonka series consists of very deep, poorly drained, slowly permeable soils that formed in local alluvium over till or glaciolacustrine deposits. These soils are in closed basins and depressions on till and glacial lake plains and have slopes of 0 to 1 percent. Mean annual air temperature is 42 degrees F, and mean annual precipitation is 20 inches.
TAXONOMIC CLASS: Fine, smectitic, frigid Argiaquic Argialbolls
Depth to carbonates commonly is 28 to 40 inches but ranges from 20 to more than 60 inches. The depth to the Bt horizon ranges from 12 to 28 inches. The soil commonly is free of rock fragments, but in some pedons the lower part of the solum and the substratum contain pebbles. Some pedons have surface stones.
DRAINAGE AND PERMEABILITY: Poorly drained. Slowly permeable. Runoff is ponded. A seasonal high water table is at a depth of 0.5 foot above the surface to 1 foot below the surface at some time during the period April through June.
USE AND VEGETATION: Used for small grains, hay and pasture. Native vegetation is tall grasses, sedges and rushes.
For a detailed description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/T/TONKA.html
For acreage and geographic distribution, visit:
Tonka soil and landscape
The Tonka series consists of very deep, poorly drained, slowly permeable soils that formed in local alluvium over till or glaciolacustrine deposits. These soils are in closed basins and depressions on till and glacial lake plains and have slopes of 0 to 1 percent. Mean annual air temperature is 42 degrees F, and mean annual precipitation is 20 inches.
TAXONOMIC CLASS: Fine, smectitic, frigid Argiaquic Argialbolls
Depth to carbonates commonly is 28 to 40 inches but ranges from 20 to more than 60 inches. The depth to the Bt horizon ranges from 12 to 28 inches. The soil commonly is free of rock fragments, but in some pedons the lower part of the solum and the substratum contain pebbles. Some pedons have surface stones.
DRAINAGE AND PERMEABILITY: Poorly drained. Slowly permeable. Runoff is ponded. A seasonal high water table is at a depth of 0.5 foot above the surface to 1 foot below the surface at some time during the period April through June.
USE AND VEGETATION: Used for small grains, hay and pasture. Native vegetation is tall grasses, sedges and rushes.
For a detailed description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/T/TONKA.html
For acreage and geographic distribution, visit: