1A STORRS AGRICULTURAL EXPERIMENT STATION. 
amount (10,000 pounds per acre) of manure, and in addition 
dissolved bone-black at the rate of 160 pounds per acre; the 
other (Y) with a larger quantity (16,000 pounds) of stable 
manure, but without bone-black. | 
The field was seeded to oats on the 29th of April, at the rate 
of two and one-third bushels per acre. ‘The paths between the 
plots were seeded in the same manner as the plots. The fertil- 
izer was applied to the plots at the rates shown in the following 
table, on the 30th. This is the seventh crop grown on this 
field since the experiment was begun, the kinds and amounts 
of fertilizers being the same each year. Quite a marked dif- 
ference in the growth on the different plots could be observed 
throughout the season. On July 7th, plots having phosphoric 
acid applied in the fertilizer showed an increase in growth over | 
other plots. Plots without nitrogen were pale colored, although 
the growth was nearly as large as on the plots with nitrogen. 
From the table which follows it will be seen that where only 
one ingredient of plant food was used (plots A, B, and Coy ile 
nitrogen had the greatest influence on the yield, while on plots 
where two ingredients were combined (D, E, and F,) nitrogen 
and phosphoric acid (plot D) gave: the best results. Plot G, 
with all three of the fertilizing ingredients, gave very little 
increase over D, to which no potash was applied. ‘This tends 
to show that on the soil experimented upon potash did not 
prove of much value for the oat crop, while nitrogen and phos- 
phoric acid increased the yields to a marked extent. In this 
respect the experiment agrees with the oat experiment of four 
years ago (1892) on the same plots. Experiments conducted 
on this field with potatoes show that potash and nitrogen had 
a very marked influence on the yield, while phosphoric acid 
gave comparatively little increase. This seems to indicate that 
the special needs of different crops, as well as the deficiencies 
of the soil, must be taken into consideration before fertilizers 
can be used with the best results. It will be of interest to 
compare the yields obtained with different crops during the 
past seven years, as shown in the table below the one giving 
the yields of oats for 1896. 
