152 STORRS AGRICULTURAL EXPERIMENT STATION. 
From the results given in these tables it would seem that 
there is very little relationship between the quantities of nitro- 
gen used in the fertilizer and the percentages of protein found 
in the crop. The percentage of protein in the crops from the 
plots upon which only mineral fertilizers were used is about 
as high as that in the crops from the plots to which nitrogen 
was applied in addition to the minerals. In the case of the cow 
pea as cut for fodder (see Table 20) the only noticeable increase 
in the percentage of protein was found in the crops from the 
plots upon which 75 pounds of nitrogen per acre was used. In 
the case of the soy beans, however (see Table 21), it appears 
that the nitrogen of the fertilizer had a little more effect upon 
the composition of the crop; for there is a difference in the per- 
centage of protein in the crops from the different plots, a small 
increase corresponding fairly regularly to the increase in the 
quantities of nitrogen in the fertilizers used. In the crops from 
the plots upon which the full ration of nitrogen was applied in 
nitrate of soda the percentage of protein was 2.3 per cent. 
higher than that in the crops from the plots upon which only 
the minerals were used. Similarly, a small gain in the protein 
of this crop may be noticed when sulphate of ammonia is the 
source of nitrogen in the fertilizer. 7 
The total yields of dry matter and of protein per acre in the 
cow pea fodder and soy beans are given in the following tables. 
The weights of the yields given are the averages in bold face 
type found in Tables 37 and 39, pages 199 and 203. 
a ha 
