122 



University of California Publications in Agricultural Sciences [Vol. ] 



Table 15 — (Continued) 



Per cent 

 total Per cent 

 Fertilizer applied protein gliadin Ash 



26. Sulphate of potash, 6 lbs., superphosphate, 30 



lbs., 1908-09; nothing, 1907-08; legume, 



1909-10 12.51 5.287 1.71 



27. Check, no fertilizer 11.23 4.692 1.93 



28. Nitrate of soda, 5 lbs.; hydrate of lime, 132i/^ 



lbs *11.91 5.265 1.86 



29. Nitrate of soda, 5 lbs *11.89 5.065 2.14 



* Plats 1 and 2 were discontinued in 1910 on account of building and plats 28 and 

 29 were substituted. 



THE EFFECT OF NITROGEN 



Collecting the results as to the effect of nitrogen upon the 

 protein content, the following figures hold : 



From the above it does not appear that increasing the avail- 

 able nitrogen content of the soil in these trials has had any 

 material influence in increasing the nitrogen in the grain, nor 

 has there been any cumulative effect shown by its use. This is 

 shown by the individual cases as well as in the general averages. 

 Considering individual cases, Plat 5 and Plat 6 may be compared, 

 each receiving equal amounts of potash, while the former received 

 also 100 pounds of nitrate of soda per acre, but it carried only 

 .17 per cent more protein than the plat receiving no nitrate. 

 Plat 6 received an application of 200 pounds of nitrate of soda, 



