New York AGRICULTURAL EXPERIMENT STATION. I8I 
In order to secure definite information on this point the fol- 
lowing experiment was made on the Station grounds in 1905: Six 
rows of potatoes, 290% feet long and of the variety Rural New 
Yorker No. 2 were planted especially for the experiment. Rows 
I, 3 and 5 were sprayed three times with cold bordeaux, while 
Rows 2, 4 and 6 were sprayed on the same dates with warm bor- 
deaux about the temperature of the air. The spraying was done 
with a knapsack sprayer and very thoroughly. ‘The temperature 
was obtained immediately before spraying commenced by thrusting 
a thermometer into the knapsack after it was in position on the 
back of the operator. Two knapsackfuls were required to spray 
three rows and in the case of the cold bordeaux it was difficult to 
get the same temperature in both. This explains why two tem- 
peratures are given in the “cold bordeaux” column of the table 
below. The low temperatures were obtained by the use of cracked 
ice. The following table shows in condensed form the conditions 
under which the experiment was made: 
TABLE XVI.—CoNDITIONS IN THE EXPERIMENT OF COLD vs. WARM 
BORDEAUX. 
Temperature | Temperature | Temperature f 
DATE OF SPRAYING. of cold of warm of the Cloudiness, 
bordeaux. bordeaux. air. 
——_—_—_— 

Deg. Fahr. Deg. Fahr. | Deg. eae 

jure "5 SE oa er eee 50 to 54 74 | Clear 
MRR Ay coe s shi nO eye tees BRS ees 50 to 54 81 | 88 | Clear 




ASU Sie oer te heed sci Aiedaee tae | 40 to 42 70 82 | Clear 
At no time during the experiment was there any evidence that 
the cold bordeaux had injured the foliage and when the potatoes 
were dug it was found that the rows sprayed with cold bordeaux 
outyielded those sprayed with warm bordeaux at the rate of 4% 
bushels per acre. This difference in yield may have been due to 
other causes than the difference in temperature of the bordeaux 
used, but being in favor of the cold bordeaux it removes all doubt 
as to the injurious effect of cold bordeaux. The results of this 
experiment seem to justify the opinion that no attention need be 
paid to the temperature of the water used in making bordeaux for 
spraying potatoes.*® 

* This statement applies only to the effect on the foliage. In this experi- 
ment no special attempt was made to determine the effect of the temperature 
