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Relative Water Losses by Evaporation and Transpiration in Field Corn¹

ABSTRACT

The separation of transpiration by corn and evaporation from the soil was experimentally accomplished, in the field, by covering the ground surface with polyethylene plastic. It was found that as much as 50% of total evapotranspiration could be accounted for by evaporation from the soil surface. Transpiration was found to be influenced in a minor way by plant population and soil moisture environment. Corn yields were depressed in only 1 year by elimination of summer rainfall.

¹ Joint contribution of the Soil and Water Conservation Research Division, ARS, USDA, Urbana, Ill., and the Illinois Agr. Exp. Sta.

² Soil Scientist, Agricultural Research Service, Urbana, Ill., and Head, Department of Agronomy, University of Illinois, respectively.

Received for publication August 14, 1958. Accepted for publication November 13, 1958.