HOW TO INCREASE THK POTATO CROP BY SPRAYING. 



21 



the sulphate is dissolved, which requires three or four hours, remove 

 the sack and stir into the barrel enough additional water to make 

 exactly 25 gallons of the copper solution. 



Prepare the lime by slaking it slowly and tlioroughly in a clean 

 barrel, strain, and add enough additional water to make exactly 25 

 gallons of lime milk. Stir thoroughly. 



Pour the two ingredients together hito another barrel or, better, 

 directly into the spray tank, if it will hold 50 gallons. It is highly 

 important to stir the mixture very thoroughly and to stram both 

 ingredients before they are combined, as otherwise clogging of the 

 spray nozzles might result. Use copper or bronze wire strainer of 

 18 meshes to the inch. Do not put copper sidphate or Bordeaux 

 mixture into tin or iron vessels; use wood or copper containers. Mix 



the Bordeaux as needed 



and apply at once. It is 

 never so good after it has 

 settled. 



STOCK SOLUTIONS. 



Everyone who uses Bor- 

 deaux mixture frequently 

 and in quantity will find it 

 convenient to keep on hand 

 concentrated stock solu- 

 tions of copper sulphate 

 and of lime in separate con- 

 tainers. These stock solu- 

 tions keep indefinitely if 

 the water which evaporates 

 is replaced. 



Build an elevated plat- 

 form to hold the barrels. 

 Some time before the day 

 on which you wish to com- 

 mence spraying, suspend 50 

 pounds of copper sulphate 

 to dissolve in a 50-gallon 

 barrel of water. Slake 50 

 pounds of lime in another 

 barrel. Add water to make 

 50 gallons of lime milk. 

 "When Bordeaux mixture is 

 needed, stir both stock bar- 

 rels and take from each as 



Fig. 22.— Compressed-air sprayer standing upright, -howing „ .r, r i 



hose, nozzle, and other attachments. many gallons as the formula 



