264 



STATE BOARD OF AGRICULTURE. 



Fio.2. The hill on righf unspraved: The hill on the lelt^sprayed every 4 days with Bordeaux 

 mixture. Photo^taken Sept. 23, 1905. — Photo byJFletcher. 



TABLE NO. 6. 



Sprayed with Bordeaux Mixture Ecery Ten Days. 



Yield per acre of mercliantable tubers 80.5 bu. 



Yield per acre of small tubers 19.2 bu. 



Total yield per acre 100.7 bu. 



Gross receipts per acre at 50 cents per bu $10 25 



Gross gain in dollars per acre by spraying 19 75 



Increase in yield per acre by spraying 39.5 bu. 



Number of sprayings 6 



Total amount of lime used per acre 18 lbs. 



Total amount of copper sulphate used per acre 15 lbs. 



|0 08 



1 05 



3 18 



Cost of lime per acre 



Cost of copper sulphate per acre. 

 Cost of application 



Total cost of spraying per acre $4 31 



Net gain per acre 15 44 



