96 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
The items of expense for spraying 6% acres five times were 
as follows: 
200° Ibs. ‘copper ‘sulphate (@".7¢.40.7)...'e: . Gee aA Rae Ree $14.00 
Witenes AON, SE ee Kt hie ge ame 1.00 
64) Ibs:paris igréen:@ 206 yacis ond.) eins Ohh ee 12.80 
40, hrs. Jabor.for man and horse @ 25¢.;... 4... . sss os ¢fe ene 
Wear One Sprayer... oo sc eeny soc cole wiacelp aren ok oll alesse de 1.25 . 
MOCO oi anise ps vrauaie e aAi be tie dae od whim oe eel ee $39.05 
The total expense of spraying was $6 per acre or $1.20 per 
acre for each application. 
The test rows were dug with a potato digger on October 16. 
In both fields they were 465 feet long by 2.4 feet wide, 39 rows 
being required to make an acre. The yields were as follows: 
In the 2\%4-acre field. — 
Second sprayed row on one side, 281 lbs. marketable tubers. 
Middle unsprayed row, 221 Ibs. marketable tubers. 
Yield, sprayed, 182 bu. 39 lbs. marketable tubers per acre. 
Yield, unsprayed, 143 bu. 39 lbs. marketable tubers per acre. 
Gain, 39 bu. marketable tubers per acre. 
The yield of small potatoes was at the rate of 12 bu. 21 lbs. per 
acre for the sprayed row and 14 bu. 18 lbs. per acre for the un- 
sprayed row. 
In the four-acre field.— 
Second sprayed row on the east, 379 lbs. marketable tubers. 
Second sprayed row on the west, 376 lbs. marketable tubers. 
Average of two sprayed rows, 377% Ibs. marketable tubers. 
Middle unsprayed row, 309 lbs. marketable tubers. 
Yield, sprayed, >45 bu. 22 lbs. marketable tubers per acre. 
 Vield, unsprayed, 200 bu. 51 lbs. marketable tubers per acre. 
Gain, 44 bu. 31 lbs. marketable tubers per acre. 
The yield of small potatoes in this test was at the rate of 
24 bu. 3 lbs. per acre for the sprayed rows and 27 bu. 18 Ibs. 
per acre for the unsprayed row. 
There was no loss from rot in either test. Combining the results 
obtained in the two tests we have an average gain of 4134 bu. per 
acre, worth, at fifty cents per bushel, $20.87. Subtracting from 
this sum $6, the expense of spraying, there remains a net profit of 
$14.87 per acre. 
