POTATOES 



359 



as above described. An arrangement for preparing Bordeaux 

 mixture on a larger scale is shown in figure 129. 



The mixture should be applied by means of nozzles producing 

 a mistlike spray. On a large scale automatic horse-power machines, 

 such as shown in figures 130 and 131, will be required to do the 

 work economically, but on a small scale the work can be done with 

 a knapsack or other hand-power sprayer. The sprayings must begin 

 early in the season and be frequent and thorough to be effective. 



FIG. 130. Spraying rig designed to spray from below up and on top 



Harvesting. When potatoes are grown upon a comparatively 

 small scale, the harvest will have to be carried on with hand im- 

 plements, for it would not be profitable to invest in modern har- 

 vesting machines. 



In harvesting by hand, two types of implements are used : the 

 spading fork, or potato fork, as it is sometimes called, which car- 

 ries four or five broad tines ; or a strongly made, round-tined fork, 

 carrying tines closely set. If the round-tined fork could be made 

 as strong and durable as the broad-tined pattern, it would be a more 

 desirable implement, as there is less injury to the tuber if punctured 

 by a round tine than if punctured by the broad tine of the spading 



