1913] Shaw : Studies on Influences Affecting Protein Content of Wheat 123 



while Plat 7 received no fertilizer, and yet the average protein 

 content of the latter shows .18 per cent higher than the former. 

 Further, in the case where a complete fertilizer was used, as 

 in Plats 17 and 19, the former receiving double the quantity 

 of nitrate of soda, the latter showed .59 per cent protein above 

 the former. The results for the entire period show that increas- 

 ing the available nitrogen of the soil had no general influence 

 toward increasing the protein content of the wheats, either when 

 used alone or when used in connection with the other plant food 

 elements. 



Comparing the effect of nitric nitrogen with organic nitrogen, 

 as dried blood, in a complete fertilizer, the following results 

 stand for the four years : 



1908 



Plat 18 — Nitric nitrogen 9.24 



Plat 23 — Organic nitrogen 10.28 



This set seems to show a very slight increase due to the organic 

 nitrogen, but it is so slight as not to affect in any material way 

 the quality of the grain, and the variations are such as to render 

 it more than probable that such variations as do occur are due 

 to other causes, possibly moisture, rather than to the nitrate 

 present. 



THE EFFECT OF INCEEASING THE NITROGEN CONTENT OF THE 



SOIL IN THE PRESENCE OF LIBERAL AMOUNTS 



OF PHOSPHORIC ACID 



In these trials, nitrogen in the form of nitrate of soda was 

 used in connection with an application of phosphates, as shown 

 in the tabulation : 



Nitrogen and phosphate plats Check plats 



Plat Per cent 



No. protein 



8 11.02 



12 10.64 



12 10.64 



22 11.06 



22 11.06 



10.88 



