Potato Culture. 163 



4. By frequent surface tillage, moisture may be conserved and 

 potential plant-food made available. 



5. Commercial fertilizers should be used only when the soil 

 fails to respond satisfactorily to tillage, or to supplement manures 

 and cover crops and stores of plant-food already in the soil. 



6. Level culture is preferable to ridge or hill culture for con- 

 serving moisture. Ridges should only be used when the object 

 is to relieve the soil of moisture as in low, damp fields. 



7. All other requisites being present to insure a satisfactory 



crop, full success cannot be secured unless the foliage be kept 



healthy and intact. 



I. P. Roberts. 



h. A. Clinton. 



