A Study ot Colorado Wheat 
117 
than the flinty crop. These two crops, igTown with irrigation, show 
in a very marked manner the composition characteristic of the two 
classes of wheat. Our dry-land wheats are usually winter-wheats, but 
they show this difference in physical properties and these characteristics 
in their composition, so it is not a question of water supply. Another 
dry land sample of Turkey Red presents as marked a case of yellow- 
berry as any sample of this wheat in my possession, and contains only 
9.04 percent of protein, while the other samples of yellow-berry wheat 
of the same variety, grown with irrigation, contained 9.65, and 10.05 
percent protein- Irrigated wheat of the same variety, grown in the 
same section; of country as the latter two, and from the same lot of 
seed, contained 13.21 percent of protein, but it was all flinty. The mills 
willingly accepted this sample, but objected to the former. These sam¬ 
ples are good illustrations of my previous statement that the phosphorus 
is usually lower in the flinty wheats, in which the flintiness is directly 
due to the influence of nitric-nitrogen. We have in the last two yellow- 
berry wheats, 0.309 and 0.345 percent phosphorus; the flinty wheat, 
which undoubtedly owed its flintiness to nitrates in the soil, contained 
0.231 percent. They also serve to illustrate the other statement that 
the potassium is usually a shade higher in the yellow-berry wheats 
than in the flinty ones, in the yellow-berry samples we have 0.539 
0.561 percent potassium, in the flinty samples we have 0.485 percent. 
The statement previously made was based upon results with spring- 
wheats. These Turkey Red wheats were grown with a water supply 
ranging from 6 inches of rainfall to 6 inches of rainfall plus one good 
irrigation during the season in whi(± the wheat ripened. 
We have just seen that a scarcity of water does not prevent yellow- 
berry, which is used in this connection as indicative of composition, as 
much as to indicate a physical condition. We have also shown that 
much water does not produce it, and further does not affect the com¬ 
position of the wheat under ordinary conditions. I am at the present 
time satisfied that under some conditions, a too liberal supply of water 
would produce changes in the composition of the wheat, but for all 
ordinary conditions I let the above statement stand unmodified. I 
will repeat some data already given to show to how great an extent 
I am justified in making this statement. I have two samples of spring- 
wheat, one of Defiance, the other of Red Fife, which were grown with¬ 
out irrigation and with a rainfall of 6.77 inches. These samples con¬ 
tained 13.92 and 15.20 percent protein respectively. A sample of the 
latter variety grown with irrigation and grown close to the last one 
given, within 150 feet, contained 17.14 percent protein, while the seed 
from which the Defiance sample was produced, grown with irrigation, 
contained 14.92 percent of protein. A very much fairer test of the 
effects of the amount of water upon the prevalence of yellow-berry 
