32 



H. H. Love and C. E. Leighty 



40-45 

 45-50 

 50-55 

 55-60 

 60-65 

 65-70 

 70-75 

 75-80 

 80-85 

 85-90 

 90-95 



I-( 



T-t 



<N 



IM 



CO 



CO 



^ 



Tjl 



io 



1 



















1 



1 



1 















2 



5 



1 















9 



4 



5 















2 



10 



16 



6 



2 













7 



10 



34 



8 



1 











1 



18 



37 



27 



9 



2 











6 



18 



43 



29 



5 













6 



29 



42 



20 



5 











1 



6 



20 



1 



29 

 5 



11 

 10 



1 ! 



2 , 



8 28 57 100 115 102 61 26 



1 

 3 



8 

 11 

 36 

 60 

 94 

 99 

 102 

 68 

 18 



500 



Fig. 20. — Average height of plant in centimeters, subject 



Average number of spikelets per culm per plant, relative. 1909 

 Coefficient of correlation ^^ .817 dz .010 





S 





B 



CO 

 CO 



§ 





o 









o 



i 





CO 



o 



LO 



s 





45-50 





1 



1 













2 



50-55 



3 



5 



1 













9 



55-60 



4 



8 



5 



2 





2 







21 



60-65 



2 







15 



9 



3 









34 



65-70 





2 



26 



37 



24 



5 



3 





97 



70-75 







11 



37 



48 



23 



4 





123 



75-80 









11 



35 



27 



12 



4 



89 



80-85 









1 



2 



9 



8 



4 



24 



85-90 























90-95 















1 





1 



9 21 59 97 112 66 28 8 



400 



Fig. 21. 



- Average height of plant in centimeters, subject 

 Average number of spikelets pe)' culm per plant, relative. 

 Coefficient of correlation ^^ .712 ± .017 



1910 



years, varies from .699±.012 for 1908 to .817±.010 for 1909. The 

 correlation is fairly stable and very high. From this it may be concluded 

 that the number of spikelets produced is largely dependent on the vigor 

 of the plant as expressed in height of culm, the taller plants tending very 

 strongly to produce large numbers of spikelets. 



The correlation between average height of plant and number of culms 

 per plant (Figs. 22, 23, 24), determined for three years, varies from 



