CONDITIONS AFFECTING PRODUCTION OF NITROGEN. 



41 



content in the grain also conduce to a large accumulation of nitrogen 

 1>\ the crop, or perhaps it would be more accurate to say that the 

 conditions which favor a large accumulation of nitrogen by the crop 

 often result in giving it a high nitrogen content. 



Reference has already been made to the observations of Deherain 

 and Dupont" on the wheat crops of 1888 and 1889 at Grignon. The 

 {inures for the yields of grain, the percentages of starch and gluten, 

 and the production per acre of these constituents for the two years 

 are as follows: 



From this it will be seen that for the year in which the yield of 

 grain was less per acre the production of gluten per acre was greater. 

 Apparently the conditions were favorable for a large accumulation 

 of nitrogen by the plant in 1889, but w r ere unfavorable to the pro- 

 duction of starch. If the latter had not been the case, the crop of 

 1889 would have been larger than the crop of 1888. 



A number of instances of this kind have occurred among the \vheat 

 crops at the Nebraska Experiment Station. In fact, it may be said 

 that, in general, large \4elds of grain have there been accompanied 

 by a low percentage of nitrogen per acre as compared with the same 

 properties in small yields of grain. The following table will show 

 this: 



Production of nitrogen per acre in wheat raised at the Nebraska Experiment Station. 



Yield decreased by lodging of grain. 



A word in regard to the character of the seasons that produced 

 these crops may help to an understanding of their differences. 



Ann. Agron., 28 (1902), ;x 522. 



