158 Some Factors in Plant Competition 



room for growth was available. The number of plants with various 

 numbers of ears was as follows : 



Nmriber of plants with specified numbers of ears. 



No. of ears per plant 







1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 



Crowded plants 

 32 

 3 

 2 

 4 

 3 

 3 

 4 

 4 

 4 

 3 

 1 

 1 



Spaced plants 



3 



3 



3 



6 



5 



1 

 13 

 14 

 12 



3 



Number of 



plants 



35 



30 



25 



20 



15 



10 



1 



8 



10 11 



2 3 4 5 6 7 



Number of ears 

 Fig. 5. Curves showing the number of barley plants with various numbers of ears when 

 grown under conditions of (1) crowding, (2) adequate spacing. 64 plants in each set. 

 Black line^spaced plants. 

 Dotted line — crowded plants. 



The above figures are graphically expressed in Fig. 5. As such a large 

 proportion of the plants have from 6-8 ears this may be regarded as a 

 standard type. 



The spaced plants occupied a rather large area of bench in the green- 



