26 
The Colorado Experiment Station 
10. KUBANKA 
Soluble phosphorus, 40 lbs. per acre. 
Yellow-berry, 3 5 percent. 
11. KUBANKA 
Potassium, 150 lbs. per acre. 
Yellow-berry, 37 percent. 
12. KUBANKA 
Check. Yellow-berry, 31 percent. 
The above diagram is self explanatory. The grains used were 
Defiance, Red Fife and Kubanka; the fertilizers were nitrogen, 
phosphorus, and potassium. 
The percentages of yellow-berry obtained are indicated on each 
plot. Note the variations in each variety, depending upon the 
kinds and proportions of fertilizers used. 
While we made thirty-six experiments in each of the years we 
will consider only twelve plots for three reasons: First, it 
will shorten the statement of our data; Second, the other twenty- 
four sets of data would simply confirm the twelve sets which we 
give, and, Third, I do not wish to anticipate, any further than is 
necessary for my present purpose, the data bearing upon the prin¬ 
cipal object of the real project in hand, which is not to discover 
the cause and prevention of yellow-berry in wheat, though this may 
be the most far-reaching and practical residt which I shall obtain. 
The land used in these experiments has been cropped continu¬ 
ously for six years without fertilization. It is now seven years 
since it was in alfalfa. The soil proper varies from eight to twelve 
inches in depth. While the subsoil is a little richer in lime 
salts, it differs less from the soil above it than is usually the case. 
This subsoil is capable of forming a very desirable soil when 
brought to the surface, aerated and permitted to become enriched 
in nitrogen. Only the principal features of the composition of 
this soil and subsoil is given, but these are sufficient for our pur¬ 
pose, namely, to give as correct an account of our conditions as is 
possible; for this purpose the amounts of phosphoric acid, potash 
and nitrogen are all that we deem necessary. 
