A Study of Colorado Wheat 
23 
It appears from this table that the shortest plants, with the 
shortest heads, were produced on the plots receiving potassium. 
The lowest average kernels per spikelet is found for those plots to 
which nitrates had been applied, but we find here the highest aver¬ 
age for the length of head. This last is the only feature that holds 
throughout the table and this is not very pronounced. This table 
shows that the effects of the fertilizers given are neither great nor 
uniform, even in the small effects produced. We might infer from 
the effect of the nitrates that an excessive food-supply lessens fe¬ 
cundity. 
RATIO OF THE STEMS, LEAVES AND HEADS IN THE 
GREEN PLANTS 
The following table, which gives the relative green weights of 
the stems, leaves and heads for the plants grown with the different 
fertilizers, shows a few differences in these ratios, but they are not 
constant. The figures are based upon 2,000-gram samples and the 
loss represents the waste in preparing and cutting them, including 
the evaporation that took place. This was often very considerable, 
especially if the plants were wet, due to external moisture, which 
was often the case and unavoidable, as we had to cut the samples in 
the morning in order to handle them the same day. 
