A STUDY OF COLORADO WHEAT 
By W. P. HEAD DEN 
PART II 
In Part I of this study (Bulletin 208) we gave the results ob¬ 
tained during the season of 1913 in a study to determine the mois¬ 
ture in the soil, the variations of the nitric nitrogen in the soil, the 
various nitrogen compounds in the plants from the time of bloom 
till the wheat was ripe, and also the ash constituents of the plants* 
The nitric nitrogen in the plants was not given because we 
wished to repeat our work on this subject. Our results were not 
concordant, neither did they agree with such data on the subject as 
I was able to find, dost, in his Lectures on Plant Physiology, makes 
the statement that the air-dried plant may contain from 1.8 to up¬ 
wards of 2.0 percent of nitric nitrogen, but says nothing about its 
occurrence in the green plant. He does not say whether it always 
occurs or not; the impression made by his language is that it may 
or may not be present. The quantities given are so far in excess of 
anything that we found, that we deferred, any consideration of the. 
subject at that time. 
The ash constituents of the plants weye given for some samples 
taken in 1913 and of one series taken in 1914. This last series was 
taken when the plants were entirely ripe and were really straw; 
the other samples were much less mature. This difference in the de¬ 
velopment of the plants at the time that they were cut lessens, in 
some degree, the value of the results for the purposes of comparison, 
but does not detract from their value in showing the effects of the 
fertilizers applied to the different plots upon the mineral constitu¬ 
ents of the ash. 
The purpose of this preliminary work has been stated to be the 
finding out of the distinguishing character of Colorado wheat, if it 
has any, and to ascertain if possible those factors in our conditions 
which determine this character. 
With this Durpose in view, and to establish what the effects of 
