262 STATE BOARD OF AGRICULTURE. 



On digging the different plots a great difference in the yiefd was 

 noted. The results were computed for an acre in each case and the 

 cost of spraying was also kept. There was no need of spraying with 

 an arsenite for bugs as only a few old ones were found on the vines, and 

 they were picked off by hand in order that absolutely pure data might 

 be obtained for each plot. 



The following tables give the results obtained: 



TABLE NO. 2. 



Vnspraijed. 



Yield per acre of merchantable tubers 41 bu. 



Yield per acre of small tubers 23 bu. 



Total yield per acre G4 bu. 



Gross receipts at 50 cents per bushel at time of digging |20 50 



TABLE NO. 3. 



Sprayed icith Lime Water Every Four Days. 



Yield per acre of merchantable tubers 52.5 bu. 



Yield per acre of small tubers 26 bu. 



Total yield per acre 78.5 bu. 



Gross receipts per. acre at 50 cents per bu |26 25 



Gross gain in dollars per acre by spraying 5 75 



Increase in yield by spraying 11.5 bu. 



Number of times sprayed 14 



Total amount of lime used per acre 42 lbs. 



Cost of material $0 19 



Cost of application 7 42 



Total cost of spraying per acre $7 Gl 



Net loss per acre 1 'J'6 



In the above table we see that while an increased yield was obtained 

 it was more than offset by the cost of aj)plication. In order to make a 

 profit the yield would have to be increased about 15 bushels of mer- 

 chantable potatoes per acre. 



