A Study of Codorado Wheat 
89 
^ A COMPARISON OF COLORADO AND SOUTH DAKOTA WHEATS 
GROWN IN 1913 
The preceding table gives the most important features in the com¬ 
position of wheat and the averages for domestic and foreign wheats. 
Further, it gives the composition of the South Dakota seed and of the 
crop grown from it in South Dakota, also the same for the crops grown 
under our conditions. An unbiased comparison of these results leads 
to the conclusion that in 1913 no changes were produced, which might 
not have been found in samples grown from our own seed, under our 
own climatic conditions and on contiguous pieces of land, one-tenth of 
an acre in area. This is true in the case of all of the data given to 
show the composition of the samples. The nitrogen determinations 
were not made by the same analyist that did the earlier work and the 
ash-analyses were all made by a third one. All nitrogen and starch 
determinations were done in duplicate, so that neither the differences 
nor the uniformities which occur are attributable to accidents or errors. 
The methods used, except those used in determining the mineral con¬ 
stituents, were conventional ones. 
The products of the three seasons, grown on the same plots of land 
and without fertilizers of any kind, vary greatly in their protein, much 
more markedly so than in their starch content. The highest percentage 
of starch found in our nine samples of crops grown is 63.37, lowest 
59.78, a range of 3.55 percent for the samples of three varieties of 
wheat in three years, with an average starch content of 61.9 percent. 
On the other hand, we have a maximum range of 6.05 percent in the 
protein, with an average of 10.7 percent. The ratio of starch to pro¬ 
tein varies between relatively wide limits from 4.3 to 7-4. This high 
ratio is evidently due tO' the suppression of the protein and not due to 
any unusual increase in the amount of starch. The samples so far con¬ 
sidered were grown on check plots and for reasons given above. 
The results given for this series of checks taken year by year 
agree fairly well with the averages obtained for all of the plots, ex¬ 
cluding those fertilized with nitrogen. 
AN AVERAGE OF THE VARIETIES SECTION BY SECTION 
In order to set forth more fully the general composition of the 
crops, the variation due to variety, and the effects cf nitrates, I have 
averaged the varieties section by section including the check plots with 
those which received phosphorus and potassium respectively; this fact 
is indicated by the expression 3/3, meaning the average of these three 
plots each time. The averages for the nitrates have been made for the 
sections only. The three varieties are included in each average which 
is designated in the same manner as the other averages. 
