iad 
EFFECT OF NITROGENOUS FERTILIZERS. 149 
The following table gives a comparison of the averages of 
yields of soy beans (seeds) from the different plots upon which 
the same kinds and amounts of fertilizers were used. 
TABLE 19.— Comparison of yields of soy beans (seeds) from plots upon 
which different gnantities of nitrogen were used. 

YIELD PER ACRE (11 % WATER). 





Plot Kinds and amounts ee eT eee 
No. of fertilizers per acre. 
Comparative scale, 450 lbs. to the inch. lbs. 
| Ibs. 
O, 0O Nothing, ‘ + [+ + © > | AINSI 458 
Ceres § Dissolved boneblack, | 320 
7, 10 § Mixed min. as plot 6, | 480 ve 
ae Mixed min. as plot 6, | 480 
be Mixed min. as plot 6, | 480 
Q, Nitrogen, F : el 794 


From this table it is noticed that there was some slight in- 
crease in the yield of the soy bean crop following the use cf 
nitrogenous fertilizers, but it was not sufficient to make their 
use at all economical for this crop. 
Soy beans and cow peas are not commonly found in our 
markets; consequently it is difficult to estimate their market 
value. I*or this reason, and because of the small size of the 
plots and the small number of experiments conducted, it has 
been thought best not to attempt to estimate the financial 
gains. , 
Effect upon the Composition.— The composition of the 
legumes was determined by analyses of samples carefully gath- 
ered in much the same manner as described in the sampling of 
other crops. Only the seeds of the soy beans were analyzed, 
because, as already explained (page 116), it was found imprac- 
ticable to take representative samples of the whole plant. AI- 
though the-total number of analyses of these crops is not large, 
yet the results of all of them appear to indicate that nitrogen 
added to the fertilizer does not tend to increase very largely 
the proportion of nitrogen compounds (protein) found in the 
crop. This is shown in the following tables, which give the 
average composition of the cow pea fodder and of the soy beans 
from all plots having uniform quantities of mineral fertilizers 
with different quantities of nitrogen. The figures in these 
tables are the averages given in bold face type in Tables 36 and 
38, pages 197 and 201. 7 
