New York AGRICULTURAL EXPERIMENT STATION. 167 
SUMMARY OF THE VOLUNTEER EXPERIMENTS IN I9Q05. 
Total area sprayed in 50 experiments, 407 acres. 
Average increase in yield per acre, 59 bu. 32 lbs. 
Average total cost of spraying per acre, (29 experiments), $4.57. 
Average cost per acre, for each spraying (29 experiments), 92 cts. 
Average market price of potatoes at digging time, 57 cts. 
Average net profit per acre (29 experiments), $29.85. 
SUMMARY OF THE VOLUNTEER EXPERIMENTS IN 1904.77 
Total area sprayed in 41 experiments, 363 3/4 acres. 
Average increase in yield per acre, 58 bu. 28 1/2 lbs. 
Average total cost of spraying per acre (23 experiments) $3.91. 
Average cost per acre for each spraying (23 experiments), 90 2/3 cents. 
Average market price of potatoes at digging time, 431/2 cents per bushel. 
Average profit per acre (23 experiments), $22.01. ; 
REMARKS ON THE VOLUNTEER EXPERIMENTS IN I905. 
It is probable that the yields, expense of spraying and other 
data given for the volunteer experiments are not as accurate as 
are those given for the farmers’ business experiments. The former 
have been furnished entirely by farmers, some of whom made the 
experiments merely for their own information and consequently 
were not as careful in measuring the yields as they would have 
been had they known that the figures were to be published. How- 
ever, the increase in yield due to spraying has in all cases been 
determined by actual measurement or weight and not estimated. 
The yields given in Table XII refer to marketable tubers only, 
except in Experiments No. 8 and 21 as noted below. The expense 
of spraying includes both labor and chemicals and, in some cases, 
also an allowance for wear of sprayer. 
Several of the experiments have interesting features which could 
not be shown in the table; hence they are brought together here. 
Experiment No. 1.—The dates of spraying were July 3, II, 22, 
August 4, 16 and 29. There was practically no loss from rot either 
on the sprayed or unsprayed rows. The difference in yield (75 bu. 
per acre) was due to the longer growth on the sprayed rows. 
“Spraying appeared to prolong the life of the vines 1ahout three 
* Copied from Bulletin 264, page 187. 
