100 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
, e 
The items of expense for spraying four acres four times and five 
acres five times were as follows: 
123.Ibs’ copper sulphate’ @8¢ .\00 VO $9.84 
S2ilbs. lime: @iore Sl. SUA eh, a ae .82 
14) lbs., paris: green’ @i25¢ oe.u. cisvcs bo. BO. Lee eee 3.50 
20; Ibs. arsenate of lead @ 206... 0.) 2. ion aie seine e ecue oa 4.00 
23 hrs. Jabor, man’ and. team, @ 306... 04 .-044,4 ure 6.90 
Wear On Sprayer: os. sc cscs nt o Bt eo Ot ene 5.00 
Ota es ose Salts wale nk iy ae A a $30.06 
The average total cost of spraying was $3.34 per acre or 73 cents 
per acre for each application. 
The test rows were dug October 19 with the following results: 
Four-acre field— The rows were 851 feet long by 3 feet wide, 
17.06 rows being required to: make an acre. The yields were as 
follows: . 
Second sprayed row on the east, 591 lbs. marketable tubers. 
Second sprayed row on the west, 507 lbs. marketable tubers. 
Middle unsprayed row, 477 lbs. marketable tubers. 
Yield, sprayed, 156 bu. 6 lbs. marketable tubers per acre. 
Yield, unsprayed, 135 bu. 38 lbs. marketable tubers per acre. 
Gain, 20 bu. 28 lbs. marketable tubers per acre. 
There was some rot in this experiment, but the rotten tubers 
were not measured. It was estimated that the loss from rot was 
17 bushels per acre on the unsprayed row and about 4 bushels per 
acre on the sprayed rows. ‘The yield of small potatoes was at the 
rate of 18.8 bu. per acre for the sprayed and 8.5 bu. Ae acre for 
the unsprayed. 
Five-acre field; west test— The rows were 295 feet fc by 3 
feet wide, 49.22 rows being required to make an acre. The yields 
were as follows: 
Second sprayed row on the west, 208 Ibs. marketable tubers. 
Second sprayed row on the east, 222 Ibs. marketable tubers. 
Middle unsprayed row, 164 lbs. marketable tubers. 
Yield, sprayed, 176 bu. 22 Ibs. marketable tubers per acre. 
Yield, unsprayed, 134 bu. 32 lbs. marketable tubers per acre. 
Gain, 41 bu. 50 lbs. marketable tubers per acre. 
_ There was no loss from rot. The yield of small potatoes was 
at the rate of 6.1 bu. per acre for the sprayed rows and 9.8 bu. per 
acre for the unsprayed. 
