44 



H. H. Love and C. E. Leighty 



The correlation between total yield of plant and number of culms per 

 plant (Figs. 41, 42, 43), determined for three years, varies from .712zt .017 



9 10 11 



0- 1 



12 



13 















25 



1- 2 



1 



28 



24 



8 



1 









62 



2- 3 





8 



54 



34 











96 



3- 4 





1 



31 



56 



8 









96 



4- 5 







6 



56 



16 



3 







81 



5- 6 









32 



13 



2 







47 



6- 7 









11 



17 



5 



6 1 





40 



7- 8 









1 



8 



12 



8 1 



1 



31 



8- 9 











1 



7 



1 1 





10 



9-10 















1 1 





2 



10-11 













2 



2 1 





5 



11-12 















2 





2 



12-13 















1 





1 



13-14 

















1 1 



2 



13 50 115 198 64 31 19 



1 



Fig. 41. — Total yield of plant in grams, subject 



Number of culms per plant, relative. 1909 

 Coefficient of correlation = .850 zh .008 



0-1 



3 











3 



1-2 



28 



19 



3 







50 



2-3 



18 



66 



20 



1 



1 



106 



3-4 



1 



42 



58 



7 



1 



109 



4-5 





7 



59 



11 



3 



80 



5-6 







26 



14 



2 



42 



6-7 









4 



3 



7 



7-8 







1 



1 





2 



8-9 











1 



1 



50 134 167 38 10 



400 



Fig. 42. — Total yield of plant in grams, subject 



Number of culms per plant, relative. 1910 

 Coefficient of correlation ^ .712 ± .017 



500 



for 1910 to .912 ±.006 for 1912. This is positive, very high, and fairly 

 stable. It indicates that as the number of culms per plant increases there 

 is a very marked increase in the total yield of grain, or that the total 

 yield of grain is highly responsive to the culm production of the plant. 



