Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 December 1959
Published in Agron J 51:725-726 (1959)
© 1959 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Evapotranspiration in Relation to the Development of the Corn Crop1

O. T. Denmead and R. H. Shaw2

Synopsis: The corn crop in Iowa approaches the condition of a green crop, actively growing and completely shading the ground for a period of only 2 to 3 weeks during its growing season. In this period the ratio of evapotranspiration to open pan evaporation is 0.81. Before this period the ratio increases with increasing leaf area, and afterwards declines with declining physiological activity of the crop.

1 Journal Paper No. J-3615 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1276. This work partially supported by U. S. Weather Bureau Contract 9560.

2 Graduate Assistant and Professor of Agricultural Climatology, Agronomy Department, Iowa State University, Ames, Iowa.






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Copyright © 1959 by the American Society of Agronomy.