ii8 
Colorado Experiment Station 
and the composition of wheat is the Marquis wheat grown at Boise, 
Idaho, of which I will give in this place only three samples; the one 
grown with i foot of water contained 10.423 percent, the 
one grown with 2 feet of water contained 10.557 percent and the one 
grown with 3 feet of water contained 10.519 percent of protein. The 
other features of their composition were just as close to one another 
as are the percentages of protein. The other three samples in this series 
were heavily manured with farmyard manure and two of them are 
identical with the three already given. The third one differs slightly 
in its percentages of crude protein, but is the same in its true gluten, 
so that five of the six samples are identical in their composition, and 
the sixth one is at most uncertain. These samples are all strongly af¬ 
fected with yellow-berry and are very high in both phosphorus and 
potassium, but the potassium is not quite so high as in the Dicklow 
spring-wheat, which is very mealy and very rich in potassium. The 
averages for the Marquis are, potassium 0.416, and phosphorus 0.454, 
for the Dicklow, the potassium is 0.506 percent. 
The question may be raised whether i foot of water may not suf¬ 
fice to produce the maximum amount of change in the composition of 
the wheat. In this case the results obtained by the addition of the 
second and third foot of water would be wholly inconclusive. Again, 
it may be asked whether the distribution of the water was such as to 
make the test of the different quantities of the water conclusive. I 
think that the data given affords an affirmative answer to the latter 
and to the former also. But I may give the results obtained with a plot 
of Marquis wheat at this place- This plot was fallowed ground. It 
received one irrigation, i foot or less of water. The yellow-berry was 
less than 15 percent, protein 15.998 percent and phosphorus 0.374 per¬ 
cent. The Boise samples, manured and not manured, that received 
I foot of water were practically 100 percent mealy and half-mealy, con¬ 
tained 10.42 and 10.56 percent protein and 0.450 and C.449 percent 
phosphorus respectively. The weather conditions were equally favor¬ 
able in the two cases- 
In addition to this, the fact that we can grow, on the same tract 
of land, using the same quantity of water, either flinty or starchy crops 
with their characteristic composition as we will, proves that flintines.? 
and starchiness are not products of the weather, or dependent upon the 
water supply in quantities up to 36 inches, we may say 42 inches, for 
we should add six inches of rainfall. 
We have now discussed the effects of potassium and nitrogen with¬ 
out separating them or specially designating them. We have also con¬ 
sidered fully the effects of water applied as irrigating water. We have 
further considered the effects of farmyard manure, which has the 
effects of a potassic rather than those of a nitrate manure. Further 
