NEw YorRK AGRICULTURAL EXPERIMENT STATION. asl 
Yield by series—— The five rows sprayed three times constitute 
Series I and the average yield of these rows makes the yield for 
Series I. The yields given for Series II and III have been com- 
puted in the same manner. The yield by series is shown in the fol- 
lowing table: 
Taste XIJ.—- YIELD By SERIES AT GENEVA IN’ 1907. 


| 
SERIES. | Rows. Dates of spraying. Yield per acre.f 
| Bu. Ibs. 
Evers ey ima elo andy oatelilvelo eA ug ust: Qrand 24-9 oe. sons, odaiare Wee 220 15 
8 Fe 2,5.8,lland14.| July 15, 24, August 9, 24 and September 17..] 249 50 
fai 0 Seon oman onl NOtUSDra veda cml ces. we'd tidak oh Gie seek eee 176 10 


7 Marketable tubers only. 
Increase in yield due to spraying three times, 44 bu. per acre. 
Increase in yield due to spraying five times, 7374 bu. per acre. 
Considering the seemingly small amount of damage done by insect 
and fungus pests it is remarkable that spraying should have in- 
creased the yield so much. 
AT RIVERHEAD, 
The experiment at Riverhead is, essentially, a duplicate of the 
Geneva experiment, differing from it only in minor details. The 
soil was sandy loam and the previous crop had been potatoes. The 
rows were 290.4 feet long by three feet wide. Planting was done 
April 25 with a Robbins potato planter. The variety was Carman 
Not. 
The five rows constituting Series I were sprayed three times 
(June 19, July 25 and August 15) with bordeaux mixture and paris 
green and treated twice besides (June 29 and July 9) with paris 
green in lime water. 
The five rows constituting Series II were sprayed six times 
(June 19, July 2, 17, 31, August 15 and 29) with bordeaux mix- 
ture. Paris green was used with the bordeaux in the first three 
spraying and in the fifth one. 
The five rows constituting Series III (Check) were not sprayed 
at all with bordeaux but were treated twice (June 29 and July 16) 
with paris green in lime water to control bugs. 
The bordeaux mixture used was prepared in the same manner as 
in the Geneva experiment. (See page 250.) Whenever paris 
green was used it was applied at the rate of one pound to fifty 
gallons. All of the applications were made with a knapsack sprayer 
and the work done very thoroughly. 
