108 STORRS AGRICULTURAL EXPERIMENT STATION. 
seemed to be poorer toward the west side of the field. For 
this reason the field was laid out into two half-acre experi- 
ments, the order of the plots on the two being reversed, as 
per diagram. 
The yields of the duplicate plots in each case are added in 
estimating the yield per acre. This helps to eliminate the 
errors due to irregularities of soil. Beside the regular soil test, 
two other plots were added—one (X) with a medium amount 
(12,000 pounds) 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 with- 
out bone-black. 
In 1895 this field was planted to potatoes in drills 3.3 feet 
apart, on the 6th of May. ‘The crop made a fair growth 
during the earlier part of the season, but about the 18th of 
July the crop was attacked by blight. Bordeaux mixture was 
at once applied to the vines on all of the plots. Although the 
progress of the disease was checked somewhat, it gradually 
spread over the entire field. On the 1st of August some notes 
were made regarding this experiment which may be of interest 
as showing the progress of the disease where no fertilizers, 
and where different kinds of fertilizers were used. On the 
Nothing plots the blight was noted to be quite bad—vines one- 
sixth to one-eighth dead. On all of the fertilized plots having 
no potash the blight was found to be making rapid progress, 
while on the plots having fertilizers with potash, the blight 
was found to have made but little progress, and the growth of 
vines was quite vigorous. On August 19th it was noticed that 
the vines on plots O, A, B and D, were nearly all dead. On 
plots C, E, F and G, where potash was used, crops on the 
plots were about one-half to two-thirds dead. The soil on 
this field has been observed to be rather deficient in potash 
during the past three or four years. This seems not only to 
have lessened the crop where potash was omitted, but in the 
case of the potatoes, the plants when grown without potash 
seemed to have a weakened condition which appeared to favor 
the development of the blight. 
The crop as reported in the following table will be noticed to be 
quite light on all of the plots. This is due to the fact that the 
blight killed the vines before the crop had made its full growth. 

