Measurements of the diurnal and height variation of the dew-point temperature in three types of ground cover (corn, soybeans and bare ground) were made in 1948 at Ames, Iowa, using a photoelectric dew-point hygrometer. The variations are expressed as the standard deviation of a frequency distribution of the dew-point temperatures taken at half-second intervals during a minute run.

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1 Journal Paper No. J. 1760 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 996.

2 Associate Professor, Agricultural Climatology, Iowa Agricultural Experiment Station, and formerly Research Fellow, Iowa Agricultural Experiment Station, now Agent, Division of Mycology and Disease Survey, U. S. Department of Agriculture.