io8 Colorado Experiment Station 
This, as we have learned from the study of the changes of the nitrogen 
in the plant, would be just about at the beginning of the period of most 
active transfer of the nitrogen from the plant to be berry. The plots 
that received i foot of water had three irrigations, those that received 
2 feet had five, and those that received 3 feet had seven. These latter 
had an irrigation at intervals of nine or twelve days. The ground must 
have been quite wet all of the time, as the average amount applied at 
one time must have been about 5 inches, but the wheats from these plots 
do not differ in their nitrogen content; the plot that received i foot of 
water in three applications produced wheat containing 10.423 percent 
of protein and the one that received 3 feet of water in seven applications 
produced wheat with 10.519 percent protein. Neither the amount of 
water nor the distribution of it has affected the protein content of the 
wheat. It might be better to state that both together have produced 
no effect upon the composition of the wheat. It goes without saying 
that this wheat was kept growing all the time and never suffered for 
moisture. The supposition is that the weather was bright and favor¬ 
able. The element next to nitrogen in its sensitiveness to the relative 
food supply is probably phosphorus, which rises and falls inversely 
with the nitrogen; in this series it is uniformly very high, and just as 
high in the manured plots as in the unmanured ones- Attention is 
called to this particular feature at this time, for the good reason that 
I intend to point out that comparatively small amounts of nitrogen in 
the form of nitrates produce marked effects upon the composition of 
the wheat. 
Results In Colorado and Idaho Identical 
The results of these two seasons of experimentations are alto¬ 
gether consistent with the results obtained with our own samples of 
1913 and 1914, one a season of high and the other of low quality in 
our wheat. As these Idaho experiments were carried out in a much 
more systematic manner than ours, I shall content myself with these 
and omit ours. 
These facts and results apply in answering the question relative 
to the effects of the distribution of the moisture, raised in discussing 
the causes for the poor composition of our 1915 crop, in which, after 
citing the fact that our crops of 1913 and 1915 were grown with prac¬ 
tically the same amounts of water, I said: “This fact relieves me from 
the necessity of considering the quantity of water used as the cause of these 
differences, but if it were necessary to do so, I would take the ground that 
a variation in the amount of water from 12 to 36 inches would not produce 
these results.” 
Water and Manure Affect Volume of Crop, But Do Not Affect Composition 
If we admit the samples of Turkey Red grown in Idaho to a place 
in these series, of experiments, we have a range in the water used from 
