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Integrating Soil Moisture Characteristics With Classification Units of Some Illinois Soils¹

ABSTRACT

Soil moisture characteristics (15 atm., 1/3 atm., etc.) were determined for 31 soil types representing the major great soil groups recognized in Illinois. In addition such physical properties as bulk density and mechanical analysis were also determined for the principal soil horizons. Available soil moisture and field capacity was shown to vary by textural classes for each soil group studied. For example it was found that silt loam soils of the Gray-Brown Podzolic averaged more available moisture in the A horizon than the Brunizems and Planosols. It was found that the available soil mositure was highly correlated with the 1/3-atm. percentage but not correlated with the 15-atm. percentage. The available moisture was controlled principally by the silt fraction.

¹ Contribution of the Soil and Water Conservation Research Division, ARS, USDA, and the Soil Conservation Service, USDA, in cooperation with the Department of Agronomy, Illinois Agr. Exp. Sta., Urbana. Presented before Div. V, Soil Science Society of America, Atlanta, Ga., Nov. 20, 1957.

² Soil Scientist, SCS, and Soil Scientist, ARS, Urbana, Illinois.

Received for publication July 24, 1958. Accepted for publication October 9, 1958.