110 THE POTATO 



Enough moisture can often be stored in the soil 

 during the fall or winter to grow a crop of grain or 

 potatoes. Cultivation usually plays quijte a prom- 

 inent part in raising such crops. If too often 

 happens that where water is plentiful irrigation is 

 substituted for cultivation. Where water is 

 scarce it is an advantage to get the seed in the 

 ground just as early in the spring as is possible so 

 that the crop may be shading the ground before 

 warm weather comes on. This prevents evapora- 

 tion." 



