72 Colorado Experiment Station 
mealiness, is equal to the very best of wheats. Further, that the two 
extremes, small-grained flinty wheat, on the one hand, and mealy wheat 
on the other, differ materially from the average wheat which is a mix¬ 
ture of these two kinds, the former may be taken as carrying not far 
from 2 percent more protein and the latter 3 percent, or more, less than 
the average. 
We have intentionaly chosein conditions which present the re¬ 
sults obtained under favorable weather conditions to as great an extent 
as possible, allowing the effects of our fertilizers upon the physical 
and chemical characteristics of our wheats to come out in the fullest, 
possible (light. These effects have been shown to be determinative of 
those physical properties designated as hard and soft, which is in agree¬ 
ment with the conclusions given in Bulletin 205. Further, that these 
physical properties correspond to very deep-going differences in the 
composition of the plants and kernels, but the effects upon the com¬ 
position of the kernels are even more radical, so far as we are able to 
interpret the results, than upon that of the plant. This is particularly 
apparent in the effects of nitric-nitrogen upon the crop. While the 
effects of potassium are quite evident, they are not so striking as those 
of the nitrogen. The effects of these fertilizers or plant-foods are an¬ 
tagonistic, in that, one increases the nitrogen content while the other 
tends to depress it, regularly in the stems and leaves of the plants, and 
in the case of a sufficient predominance to produce yellow-berry, to 
depress it greatly in the kernels. The phosphorus showed no regular 
and consistent effect upon the amount of nitrogen and was, in general, 
surprisingly indifferent in its results. 
One of the reasons assigned for taking the samples grown in 1913 
as representative of the normal^ wheat crop in Colorado was that the 
weather conditions throughout the season were more nearly normal 
than those of 1914 and 1915. 
In some respects the season of 1914 was as favorable, if not more 
so, than that of 1913. But there was one feature which seriously af¬ 
fected our results; this was a short period of wet weather near the 
end of July, just before the ripening period of the grain. At the very 
end of this period we had a shower of short duration, but very heavy. 
How this injury suffered by the crop is to be apportioned between 
the whole.period and the closing feature of it, I do not know, nor do I 
know how much to attribute to the direct injury caused by the weather, 
and how much to the indirect injury caused by the development of 
rust. I think that a very large amount of the injury should be attri¬ 
buted to the latter. 
TIME AND MANNER OF RAINFALL, RATHER THAN QUANTITY, 
IMPORTANT TO CROP 
The experiments were conducted on the same land and were in all 
respects duplicates of those of 1913. This means that we had wheat 
