476 THE POTATO 



condition when grown. I am safe in saying that 

 these lands that are valued at $500 an acre on their 

 revenue-earning capacity have an earning ability 

 of 50 per cent, less than good Western irrigated 

 lands. 



SUMMARY 



The following practice of European potato 

 growers should be of interest and value to Ameri- 

 can producers: 



1. The use of deep-rooting grasses — rye grass, 

 alfalfa, etc. 



2. The use of large quantities of animal ma- 

 nures. 



3. The use of immature, northern-grown seed. 



4. The careful storage of seed stocks in trays. 



5. Selection of seed to type and purity of va- 

 rieties. 



6. Close planting. 



