CULTIVATION Of SOILS 121 



be made fertile In many parts of the West liirgv tracts 

 of country once parched d< ■■•■ being con?< 



into fine Earming land by means of irrigation. 



Questions 



1. What becomes of most seed simply scattered on the 

 surface of the soil? 2. Why is it usually found more pro- 

 fitable to bury the seed? 3. Why is it better to prepare the 

 soil before planting seed? 4. By what name do we call the 

 process of preparing the soil for planting? 5. What is 

 meant by cultivation? 6. Name two important methods of 

 cultivation that influenco the water supply in soils. 

 7. What is meant by drainage? 8. Explain how a swamp 

 or marsh is formed. 9. How are open drains made? 

 10. What is an underdraln? 11. What is a tile-drain? 

 12. How does drainage benefit the soil? 13. What is irri- 

 gation? 14. How does surface irrigation differ from sub- 

 irrigation? 15. Which is the more perfect system? 16. Why 

 Is it less used? 17. In what part of the United States it 

 irrigation most practiced? 



