150 ELEMENTS OF AGRICULTURE 



Questions 



1. What is the object in applying manures to soils? 

 2. What is meant by a general manure? 3. To what kind of 

 soils are general manures usually applied? 4. When is a 

 soil said to be worn? 5. In restoring a worn soil what is 

 the first thing to be considered? 6. Name two of the chief 

 causes of poor soils. 7. What is the usual method of in- 

 creasing the organic matter in the soil? 8. What is the 

 process called? 9. How does the plowing under of a green 

 crop improve a poor soil? 10. Why is stable manure of 

 benefit to poor soils? 11. What are the best crops to use for 

 green manure? 12. What effect does the loss of lime have 

 on the soil? 13. How may acid soil be improved? 14. What 

 is meant by a special manure? 15. Special manures should 

 contain the plant food in what form? 16. How does a 

 knowledge of the composition of crops aid in determining 

 the application of special manures? 17. Why can you not 

 lay down fixed rules for the application of manures? 



