112 FIELD AND LABOEATOKY STUDIES OF CROPS 



prefer large seed potatoes from a poor-yielding hill or medium 

 tubers selected from good hills? 



Discussion: In the improvement of potatoes, the seed 

 should be selected from the best hills rather than with 

 reference to the individual tubers. The careful selection of 



Fig. 46. — The Use of Scabby Seed Potatoes will Produce a Scabby 

 Crop. Seed Treatment will Prevent the Disease. 



potatoes from the best hills will result in increased yields 

 and an improvement in the quality of the potato. Many 

 growers believe that if the same variety is grown in the same 

 locality for a long time it will run out. The better growers, 

 however, believe that good cultural methods and proper 

 care and selecting of the seed will keep varieties in a pro- 

 ductive condition for many years, 



