34 
Journal of Agricultural Research 
Vol. XXI, No. i 
of water and consequent turgor result in a slight decrease in length. 
The average lengths of kernels from the 8 plots are shown in figure i. 
These are averages of daily measurements until July 23. After that 
date they are the averages of two days, as the length had become so 
nearly constant as to make daily averages of no advantage. The drop 
in length on July 30 is due to a change in the method of measurement. 
Fig. i.—G raph showing average length of barley kernels during growth, from plots variously irrigated. 
After this date it was possible to measure the kernels without including 
the ovary tissues, which had then been largely resorbed. Previous to 
this date the measurements include ovary tissue about 1 mm. in length. 
Figure 1 shows two things. Plot 1, which, because of the irrigation 
designed to maintain satisfactory growth, exceeded the other plots in 
size of kernels, possessed no advantage at the beginning. Its kernels 
IhG. a.—Graph showing average lateral diameter of barley kernels during growth, from plots variously 
irrigated. 
were of no greater size than those of the other plots. On the other hand, 
it is apparent that the kernels from plots 7 and 8 never attained the 
length of the kernels from plot 1 and that the shrinking at maturity 
occurred earlier in these plots. 
The maximum lateral diameter of the kernel was not attained until 
the last of July. As maturity approached, there was slight decrease. 
In figure 2 the lateral measurements of kernels from plot 2 are shown to 
