A Study of Colorado Wheat 
73 
after wheat on the check and other plots with the same fertilizers as 
were applied the season before. The land was irrigated after the crop 
of 1913 had been removed. The stubble was disced in and the land 
plowed a few weeks later. The promise of the crop of 1914 was most 
flattering up to the end of July, at which time, as stated above, unto¬ 
ward conditions intervened, the most serious of which was, probably, 
the rust, but this was undoubtedly the result of the weather conditions, 
The rainfall during the last 10 days of July, 1914, was 1.38 inches, 
of which 0*87 inches fell on the 30th in less than two hours. The mean 
temperature during this period was 69.3 degrees F. In 1913 we had 
in the last ii days of July, 1.53 inches and a mean temperature of 62. 
Nearly the whole of this fell on the 22, 23, and 24th and was followed 
bjy bright, cool weather. The grain was not beaten down and did not 
rust. It is evident that the time and manner of the rainfall and the 
conditions following it, rather than the amount of water, are the fact¬ 
ors which come into play, for the rain in 1913 exceeded that of 1914, 
but was not followed by any bad results, whereas, the rainfall of 1914, 
the greater part of which fell on 30 July, was quite disastrous to the 
Defiance and injured the other varieties. Rust developed freely, es¬ 
pecially on the Defiance, which it very seriously damaged, in fact, 
ruined. 
We have given the average composition of our samples for 1913, 
excluding those in which the nitrogen had been increased by the appli¬ 
cation of nitrates because we do not consider them truly representative. 
The average protein content (N x 5.7) was 12.53 percent and that of 
the plots receiving nitrogen was 14.18, a difference of 1.65 percent. 
The physical properties of these wheats, as well as their composition, 
are so different that their elimination from the average is not only 
justified, but necessitated as a matter of fairness. 
We have not given the meteorological details of the season of 
1914, but we have stated that they were favorable up to 30 July, and 
that the promise of an excellent yield of good grain was all that could 
be desired. 
A point suggested in a preceding paragraph relative to the order 
of the crops, i.e., wheat after wheat without and also with fertilizers, 
may occur to the; reader as important in regard to the effect of this 
fact upon the wheat, its growth and composition- I willingly acknowl¬ 
edge that this point is not covered by my data, and that we are depend¬ 
ent on observations upon the growth and development of the plants, 
together with the yields obtained to answer this. The growth and de¬ 
velopment of the plants up to 30 July was more vigorous than in 1913. 
The plants were large, the head long, and the kernels were already well 
filled out but still soft when the rain came. 
The correlation table given in Bulletin 217, p. 22, gives data set¬ 
ting forth the size of plants, length of heads, etc., and, with the table 
