Aug. a, 1920 Development of Barley Kernels in Clipped Spikes 447 



Table II. — Average net weight, length, lateral diameter, and dorsoventral diameter of 

 kernels from, normal and clipped spikes of Manchuria barley at St. Paul, Minn., in 

 igi$ — Continued 



CLIPPED SPIKES 



In both the tables and the figures it is apparent that fertiUzation did 

 not occur until about July 5; therefore, the measurements and weights 

 before that date are of the ovary. Six-rowed barleys do not flower so 

 uniformly as 2-rowed barleys. The central florets flower before the lateral 

 ones. For this reason the curve of growth is less abrupt at the beginning 

 than is the case with the 2-rowed varieties. Even with the prolonged 

 period of flowering the length increases very rapidly after fertilization, as 

 may be seen in figure i . 



The effect of the clipping is evident in both figure i and figure 2. 

 Although there is little difference in length near maturity, the lateral 

 diameters and the dorsoventral diameters of the kernels from clipped 

 spikes are noticeably smaller than those of normal spikes. The difference 

 is even more conspicuous in the wet weights per kernel. The question of 

 mechanical injury from clipping is answered by a study of the growth by 

 days. There is no such injury. For two weeks after clipping, the kernels 

 in the clipped spikes develop as rapidly in size and weight as do those in 



