
FIELD EXPERIMENTS WITH FERTILIZERS. 193 
EXPERIMENTS WITH SOY BEANS. 
As seen by the diagram on page 172 soy beans are grown 
upon the two series’ of sections lettered B and E. In the ex- 
periments with this crop, as in those with cow peas, the two 
series are used for growing the crops, but the results obtained 
on both are combined and reported as if only one series of sec- 
tions twice the size were used. The results of the experiments 
with this crop are given in Tables 45 and 46 following. ‘The 
experiments with this crop in 1896 are also included here, 
inasmuch as they have not been reported previously. The 
averages in the tables, therefore, include the results of three 
years—1896, 1898, and 1899—instead of two as in the case of 
corn and cow peas. The weights of the yields for 1897 are 
given in Table 45, but, as previously explained, they are not 
included in the averages nor considered in the discussion. 
In these experiments with soy beans only the seed is taken 
into account. No attempt was made to estimate the yields of 
the vines after the seed was removed, because by the time the 
seed is well matured nearly all of the leaves have fallen from 
the vines. 
Lhe amounts of nitrogen in the fertilizers and the total yield 
of the crop.—The results of the experiments as regards the yields 
of the crop, given in Table 45 below, show that in many cases 
the yields from sections of plots with mineral fertilizers only 
were smaller than from sections of plots with nitrogen in addi- 
tion to the minerals. ‘The differences, on the whole, are more 
noticeable in the experiments with soy beans than in those 
with cow peas, suggesting that probably the nitrogenous fer- 
tilizers had more effect in increasing the yields of the soy beans. 
The total increase in the yields, however, accompanying the 
increase in the nitrogen of the fertilizer, did not correspond 
with the amounts of nitrogen used. In the experiments with 
‘soy beans here reported, in no case was the yield largest from 
the section of the plot with the largest quantity of nitrogen in 
the nitrate of soda group, and only in one case in the sulphate 
of ammonia group. ‘The largest yields, on the average, were 
generally obtained from sections of plots with nitrogen at fifty 
pounds per acre. ‘The value of the increase, however, which 
might be attributed to the nitrogenous fertilizers, was not suf- 
cient in most cases to cover the cost of the nitrogen added to 
the mineral fertilizers. 
