New Yoek Agricultural Experiment Station. 239 



the chateaugay experiment. 



Conducted by 0. Smith & Son, Chateaugay, IST. Y. Twelve 

 acres of potatoes were sprayed four times with a one-horse, four- 

 row '" Iron Age " sprayer. Two unsprayed strips of three rows 

 each were left for checks. 



Two rows on each side of both checks were double-sprayed. 



The bordeaux was made by the 6-6-50 formula. To each fifty 

 gallons of bordeaux mixture used in the first three sprayings there 

 were added three pounds of paris green and two quarts of arsenic- 

 sal soda solution for the control of bugs. The checks were treated 

 four times with paris green. In Test No. 1 the test rows were of 

 the variety New National ; in Test No. 2 they were of the variety 

 Sulphic Beauty. There were some flea beetles and considerable 

 tip burn, particularly in Test No. 1, but there was no blight. In 

 both tests there was a slight contrast between sprayed and un- 

 sprayed rows. 



The items of expense were as follows: 



260 lbs. copper sulphate @ 6% eta $17 40 



2y2 bbls. lime @ $1.08 2 70 



53 lbs. paris green @ 25 cts 13 25 



18 lbs. white arsenic @ QV^ cts 1 17 



72 lbs. sal soda @ 2 V2 cts 1 80 



43 hrs. labor for man and horse @ 30 cts 12 90 



Total $49 22 



Expense of spraying, $4.10 per acre. 



The yields were as follows : 



Test No. 1. Rows 1,066 x 3 ft. 



One double-sprayed row, 407 lbs.= 92.4 bu. per acre. 



One single-sprayed row, 526 lbs.= 119.4 bu. per acre. 



One check row, 396 lbs.= 89.9 bu. per acre. 



Test No. 2. Rows 353 x 3 ft. 



Two double-sprayed rows, 181 lbs.= 62 bu. per acre. 



Two single-sprayed rows, 216 lbs.= 74 bu. per acre. 



Two check rows, 160 lbs.= 54.8 bu. per acre. 



Upon averaging the results of the two tests it is found that 

 single-spraying gave a gain of 24.4 bu. per acre and double-spray- 

 ing only 4.9 bu. per acre. The net profit from single-spraying 

 was $11.76 per acre and the loss from double-spraying $5.02 per 

 acre. The cause of these irregular results is unknown. 



