468 



Journal of Agricultural Research 



Vol. XIX, No. 9 



of the mineral content that usually goes into the awn remains in the 

 rachis of the clipped spike. These rachises were found to be brittle, 

 while the normal ones were not. Both in Minnesota and in Idaho the 

 clipped spikes had a tendency to shatter, while the normal spikes exhibit 



y^/^- 



8 9/0// IZ /J H- /S/6 irJ8f9Z0 2l22Z32'fZS2627ZaZ9X)J/-/ 2 3 

 Fig. II.— Graph showing total nitrogen in kernels of Hannchen barley from normal and clipped spikes. 



no such tendency. The divergence in ash content is surprisingly large 

 and widens consistently throughout the period of growth. 



The increase in nitrogen per kernel in Idaho is similar to that found 

 in Minnesota. The amount of nitrogen in the kernels from clipped 

 spikes is almost as large as that in the kernels from normal spikes. The 

 average is slightly less, but as a whole the content of nitrogen is nearly 

 equal in the two, as may be seen in figure 1 1. 



The difference in water content shown in figure 12 is more striking 

 at Aberdeen than at Minnesota. After July 15 the kernels from clipped 



