174 PRODUCTIVE FARMING 



EXERCISE. Yield and Value. Find out the usual yield 

 per acre of Irish potatoes in your vicinity, and then estimate 

 how many acres of land it would take to raise the number of 

 bushels produced in the United States in 1913. Would this 

 acreage entirely cover any of the smaller States? What was 

 the value of the yield per bushel that year? What per acre? 



REVIEW. 



1. Where was the Irish potato first found? 



2. How did it come to be called the Irish potato? 



3. Learn if you can who is said to have carried it from North 

 America to Europe. 



4. What States grow the heaviest crops of potatoes? 



5. Compare potato growing in different sections of the United 

 States, as to planting dates, keeping qualities, and in other ways. 



6. What kinds of soil are best suited to potato growing? 



7. Why do potatoes need so much moisture? 



8. Name some of the best varieties for seed. 



9. Find out what kinds are grown in your vicinity. Learn which 

 yield the heaviest crops. 



10. Tell of the times for planting early and late potatoes. 



11. Give depth for planting; also distances. 



12. Give directions for treating seed potatoes to keep the scab 

 disease out of the soil. 



13. What is the legal weight per bushel of potatoes in your State? 



14. What fertilizers do farmers use for potatoes in your locality? 



15. What green manures help the potato crop? 



16. Give directions for plowing potatoes. 



17. Give directions for selecting and preparing seed potatoes for 

 planting. 



18. Where and how are two crops grown in one year? 



19. How should a field of potatoes be cared for after planting? 



20. What insects attack the potato fields? 



21. Have any plant diseases ever destroyed potatoes in your 

 neighborhood ? 



22. How may insects and diseases be controlled at the same time? 



23. In what climates and on what soils are sweet potatoes usually 

 grown? 



24. Describe the starting of sweet potato plants for a large field. 



25. Tell how sweet potatoes are stored for winter. 



References. IT. S. Farmers' Bulletins : 324 Sweet Potatoes; 365, 

 Farm Management in Northern Potato-growing Sections; 533, Seed 

 Potatoes; 544, Potato Tuber Diseases; ,548, Storing and Marketing 

 Sweet Potatoes; 714, Sweet Potato Diseases; 753, Commercial Hand- 

 ling, Grading and Marketing of Potatoes. 



