The corn was planted at weekly intervals from April 15 to May 27. A continuous record of soil and air temperature was obtained from a soil-air thermograph set up in the plot. Tabulations were made of maxima, minima and average weekly soil and air temperatures for the germination period of each planting. The length of the period necessary for 85 per cent emergence for the seven plantings was 21, 22, 18, 18, 16, 15 and 11 days respectively. Length of germination period shows a higher correlation with average soil temperature than with air temperature. Correlation with the total heat units above a plant zero of 50° F. is highest.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Aikman, J. M.
"Germination of Corn in the Field as Affected by Soil and Air Temperature,"
Proceedings of the Iowa Academy of Science, 40(1), 84-84.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/28