106 



Clyde E. Leighty 



These varieties were all sown on the same day, but were harvested as 

 they ripened. The dates of harvesting and the figures showing thickness 

 of stand are: 



Variety 



Harvested 



Thickness of stand 



Great American . 

 Early Champion 



Welcome 



Sixty Day 



July 24, 1911 

 July 24, 1911 

 August 4, 1911 

 July 24, 1911 



400 plants in 

 = 26.7 plants 



600 plants in 

 = 33 . 3 plants 



325 plants in 

 ^ 23 . 2 plants 



610 plants in 

 = 33 . 9 plants 



15 feet 

 per foot 



18 feet 

 per foot 



14 feet 

 per foot 



18 feet 

 per foot 



It is seen that the Early Champion and the Sixty Day plants were some- 

 what more crowded in t'he row than were the Great American and the 

 Welcome. By referring to Table 4, where are given the means for average 

 weight of kernels per plant, it is seen that the means for Early Champion 

 and Sixty Day are 10.913 ± .115 and 13.067 ± .093 milligrams, respectively, 

 and for Great American and Welcome they are 22.640 ± .172 and 25.413 

 ±.155 milligrams, respectively. The latter two are thus seen to have much 

 larger kernels than the former two, which accounts for the fewer plants 

 growing in the rows of these varieties, since fifteen grams of each variety 

 were sown in rows of the same length. 



The size of kernel is a varietal characteristic and is not so much affected 

 by crowded growing conditions as is any other character except height, 

 as will be shown in another part of this paper. 



Since the growing conditions of these varieties were slightly different, 

 due to the growing of different numbers of plants in the rows, the differ- 

 ences that are observed in the means and the standard deviations are not 

 surely due to varietal differences. They should be the same, however, 

 as would be obtained were the plants taken from fields where seeding had 

 been at a uniform rate of bushels per acre for different varieties, as has 

 been done by some experimenters. 



