Abstract
The present study was undertaken during the growing seasons of 1938 and 1939 to measure weekly changes in total dry weight of four varieties of maize grown on the agronomy farm of Iowa State College at Ames, Iowa. The purposes of this investigation were: (1) to compare the growth curves of early and late maturing varieties in a given complex of climatic and edaphic conditions; (2) to make comparisons between the performance of these varieties in two different years; (3)-to ascertain whether dry weight increment varied significantly from week to week, particularly during the main period of growth; and (4) to attempt to correlate any incremental variations with climatic fluctuations.
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