EXERCISE 23 (Continued) (61) 



QUESTIONS 



1. What is the average annual rainfall for the country in which you live? 



2. How man}' inches of water are used by a (a) 400 bushel crop of potatoes, 



(6) 100 bushels of corn, (c) 3.5 tons of hay? 



3. How many inches of water may be lost by evaporation from a bare soil? 



4. Which artificial mulch is the most efficient and which is the least efficient? 



5. How does a mulch prevent loss of water by evaporation? 



6. Which is the more economical, a natural or an artificial mulch? 



7. Which mulch would need renewal the more often, clay or sandj' loam, 



and wh}'? 



8. Wh}' should cultivation always be done soon after a beating rain? 



9. What is the best depth for cultivation? Why? 



10. What effect will cultivation have on a very wet soil? 



11. What effect do you think mulches would have upon the temperature of 



a soil? 



12. What effect would scattering a light coating of manure upon meadows 



have upon the grass plants during hot, dry weather? 



13. What influence does rolling have upon the evaporation of water from 



soil? 



14. What can you say about the use of corrugated rollers? 



