TUBER CROP PROJECTS 209 



1. What are some satisfactory crops to precede potatoes ? Why 



do you think they are desirable? 

 Fr : 26-29. 



2. Should stable manure be used for potatoes ? If so, what 



kind ? How much ? When applied ? 

 Fr : 30, 36-39. Gi : 130. 



3. When should land be plowed for this crop ? When should it 



be harrowed ? 



4. Should commercial fertilizers be employed for potatoes? 



Make specific recommendations for various conditions. 

 Fr: 30-50. Gi : 113-132. 



5. What kinds and how much fertilizer will you need for your 



potato project? 

 Gi: 112-132. 



6. What should be the texture and structure of soils for the growing 



of this crop ? 



7. What are the functions of nitrogen, potassium, and phosphorus in 



the growing of potatoes f Fr : 3 1-36. Gi : 1 19-126. 



8. Should lime be used for potatoes? If so, what kind, how much, 



and when applied? Gi : 124. 



9. Ascertain the character of the fertilizer treatments generally 



employed in the leading potato growing districts of the United 

 States and Canada. In European countries. 



10. What lessons do the agricultural experiment stations teach on 

 fertilizer treatments? 



6. When to plant. — Very early potatoes are generally planted 

 about as soon as the ground can be prepared in the spring. Late 



