SUSCEPTIBILITY OF DEFT CORN TO ROOT ROTTING. 5 



experiment, that at Woodburn, Ind., the horny ears produced the 

 higher initial stand in the field. This difference in stand was main- 

 tained throughout the growing season, as shown by the figures for 

 initial stand compared with those for final stand, taken just pre- 

 vious to harvesting. This inferiority in stand was reflected in the 

 decreased yield of the starchy group. Results due to differences in 

 stand were eliminated by correcting the yields of both groups to per- 

 fect stand for each experiment. In this manner the actual superior- 

 ity of the horny seed ears becomes apparent. Thus, while the aver- 

 age difference in final stand in the 11 experiments was 2.78 per cent 

 less for the starchy ears, this was accompanied by an average reduc- 

 tion in actual yield of 5.57 per cent. Upon correcting both groups 

 to perfect stand, the average decrease in yield incurred through the 

 use of starchy seed ears amounted to 4.2 per cent. 



Table 2. 



-Actual and corrected yields from starchy and from horny ears of dent 

 corn in ear-to-row tests in Indiana in 1918, 1919, and 1920. 





Number of ears used in 

 each plat. 



Decrease resulting from the use of 

 starchy seed (per cent). 



Location of plat (Indiana). 



Total. 



Starchy. 



Horny. 



Stand. 



Yield. 





Initial. 



Final. 



Actual. 



Corrected 



to perfect 



stand. 





45 

 48 

 46 

 50 

 44 

 50 

 37 

 80 

 45 

 20 

 49 



19 

 20 

 11 

 11 

 26 

 17 

 21 

 62 

 35 

 5 

 21 



26 

 28 

 35 

 39 

 18 

 33 

 16 

 18 

 10 

 15 

 27 



4.12 

 (') 

 4.30 



( l ) 

 C 1 ) 



( l ) 



9.86 

 C 1 ) 



4.64 

 1.60 



0) 



4.26 

 3.04 

 5.48 

 1.47 



.78 

 1.73 

 6.21 



.54 

 5.05 

 1.34 



.72 



6.51 

 1.26 

 8.21 

 .93 

 7.24 

 9.21 

 8.38 

 6.40 

 6.50 

 2.39 

 4.20 



5.17 





4.44 





4.83 





.89 





6.96 



Delphi 



3.57 





4.69 





6.21 



Shelbvville 



4.05 





1.88 





3.47 









Average decrease from the 



use of star 







2.78 



5.57 



4.20 











1 Initial stand records were not made in these experiments. 



SUSCEPTIBILITY OF DISEASE-FREE SEED EARS. 



To determine the relative susceptibility to root rotting of the 

 horny and starchy groups of seed, a field experiment was outlined 

 in 1920 in which alternate rows were planted with kernels from 

 Selected horny and starchy disease-free cars of a single strain of 

 Beid Yellow Dent. In the horny group most, of the ears were classi- 

 fied as type F. In the starchy group no ears less than half starchy 

 (type C) were employed. This experiment was conducted :if, Bed- 

 ford, Ind.. and was duplicated in a fertilizer plat at Linden, Ind. 

 Tin; plats were each I acre in size. Owing to evident errors in: 

 duced \>\ marked -<>il inequalities, the taking of notes was <lis- 



