182 STORRS AGRICULTURAL EXPERIMENT STATION. 
From a comparison of the yields of shelled corn from all 
the sections in the same series it will be seen that the yields 
from the sections of the sulphate of ammonia group of plots— 
Io, I1, and 12—correspond somewhat with those from the 
nitrate of soda group—7, 8, and 9—the most noticeable dis- 
agreement being that between the yields from section F of 
plot 12, with the large ration of sulphate of ammonia, and the 
yield from section F of plot 9, with the large ration of nitrate 
of soda. That the smaller yield from plot 12 may be due to 
acidity of the soil has already been suggested. 
Lhe amounts of nitrogen in the fertilizers and the proportion of 
protein in the crop.—The following tables are intended to illus- 
trate, by the analyses of the crops, the apparent effects of the 
different fertilizers upon the composition of the plants, and 
especially the increase in the proportion of nitrogen in the 
crops following the increase in the quantity of nitrogen in the 
fertilizers. ‘The results for the grain and the stover respectively 
are shown in Tables 39 and 4o for the sections (Series A) at 
the north end of the plots, and in Tables 4r and 42 for the 
sections (Series F) at the south end. ‘The data in these tables 
include the weights per acre of the crops on the different sec- 
tions at harvest, the percentages and amounts of dry matter 
and of protein in the crop, and a comparison—expressed in 
percentages in the last two columns—of the yields of dry mat- 
ter and of protein from the sections of plots having nitrogen 
with the average of the yields from sections of the mineral 
plots. ‘This comparison between the results from. sections of 
the mineral plots and those from sections of plots with nitrog- 
enous fertilizers in addition to the minerals shows the increase 
in dry matter and protein that follows the use of the nitroge- 
nous fertilizers, and serves to indicate the relative effects of 
the different quantities of nitrogen upon the proportion of 
nitrogenous compounds (protein) in the crops. 
We here follow common usage in multiplying the total nitro- 
gen found by analysis by the factor 6.2 5 and designate the 
product as protein. It is, of course, understood that not all of 
the nitrogen is present in the plant in the form of true proteids. - 
More or less occurs in non-proteid organic compounds. Small 
quantities are at times present in plants in the form of nitrates. 
