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BULLETIN 137, U. S. DEPARTMENT OF AGRICULTURE. 



The tillering in most varieties is not completed as rapidly as is the 

 production of the fourth leaf, and it is deterred by disease much 

 more than is the leaf. 



Fig. 1.- 



-Curves showing the production of the second, third, and fourth leaves and of the 

 first tiller in 96 plants of Oderbrucker barley (selection No. 50). 



Besides the difference in dates there is a difference in method of 

 production. In some varieties the curve of each stage is very acute 

 and the stage is completed in a few days. In others it is more obtuse 



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Fig. 2. — Curves showing varietal differences in 

 the rapidity of tillering of barley selections. 

 In Eagle (No. 13) all plants produce tillers 

 almost simultaneously, while in Russian (No. 

 21) the process is extended over many days. 



Fig. 3. — Curves showing the average date 

 of the production of the second and 

 third leaves and of the first tiller in 100 

 plants of each of 17 selections of barley 

 grown in drill rows. 



and the time for completion extended. Figure 2 shows the relative 

 rapidity of stooling in two selections, the one of the first type and 

 the other of the second. 



