FIELD EXPERIMENTS WITH FERTILIZERS. 189 
experiments are not included in the averages in the table 
because of the irregularity of the experiments of that year, as 
above explained. Table 44 gives the percentages and amounts 
of dry matter in the crop at harvest, and of protein in the dry 
matter. The analyses for 1897 are also given in this table, 
but are not included in the averages. ‘These are the only 
analyses made of any of the crops grown in the special nitrogen 
experiments of 1897. 
Lhe amounts of nitrogen in the fertilizers and the total yields 
of the crop.—The results of the special nitrogen experiments in 
their bearing upon the effect of the different fertilizers upon 
the total yield of the crop are shown in the figures in Table 43. 
From these figures it will be seen that the yields from all the 
fertilized plots are about twice as large as those from the plots 
with no fertilizer. The most noticeable feature of these results 
is the large yields from the sections of the plots (6a and 60), 
with the mineral fertilizers only, as compared with the yields 
from the sections of plots having the nitrogenous fertilizers 
in addition to the minerals. The average of the yields from 
the sections of the two mineral plots is larger than the yield 
from either one of a number of the sections of plots with 
nitrogen. Hven where an increase in yield accompanies the 
application of the nitrogenous fertilizers, the amount of in- 
crease does not correspond at all with the quantities of nitrogen 
used. For instance, in the experiments of both 1898 and 1899, 
the yield from the sections of plot 7 of the nitrate of soda 
group, with twenty-five pounds of nitrogen per acre, was larger 
than that from the sections of either plot 8 or 9 af the same 
group, with fifty and seventy-five pounds per acre respectively, 
or from sections of the plots—1o, 11, and 12—of the sulphate of 
ammonia group. The inference from these results is that, so 
far as the growth of the plants is concerned, good returns fol- 
low the application of the mineral fertilizers upon cow peas, 
but the application of nitrogen has little effect upon the yield. 
In the experiments of 1898 the total yield of this crop from 
the sulphate of ammonia group of plots was practically the 
same as that from the nitrate of soda group. In the 1899 
experiments, however, and in all other experiments with this 
crop during the past five years, except those of 1898, the yields 
of cow pea fodder were, on the whole, smaller from the sul- 
phate of ammonia group than from the nitrate of soda group. 
