REVIEW OF THE BOOK 303 



nitrogen-consumers, or those that do not add nitrogen to the soil. 

 Do they belong to any one group or family of plants! Name the 

 three great staple green-manure crops of the nitrogen-gathering 

 class (111). What is meant by intensive farming (Ilia) ? What 

 by extensive farming (1116)? 



What is the ideal method of securing the green-manuring 

 crop in general agriculture (112)? Can a regular rotation be 

 practiced in most kinds of intensive farming? Why is land bene- 

 fited by being "rested" in clover or some other crop? Explain 

 how land may be benefited sometimes even by "resting" in 

 weeds. What are the two values of green-manure crops (114)? 

 Is it true that green -manures may be valuable even when more 

 plant-food is not needed? Apply this to fruit-growing crops. 

 How may a system of green-manure cropping be inaugurated on 

 hard and poor lands? Where are cover-crops most useful, and 

 why? How early should the cover-crop in orchards be plowed 

 under? May weeds ever be useful in orchards late in the season? 

 Why should they not be allowed to grow early in the season? 

 What are the disadvantages of allowing weeds to grow even late 

 in the season? 



What does the application of stable manure do for the land? 

 Upon what does its value depend (119)? How should stable 

 manures be protected or stored? Explain what you understand by 

 a covered barnyard (120rt). How are stable manures affected by 

 exposure to the weather? What is the value of thoroughly rotted 

 manure? What is the philosophy of composting manures? When 

 the manures cannot be sheltered or protected, what disposition 

 may be made of them? What precautions? 



What is the value of muck? What is peat, and what is its 

 value? Discuss marl; also sawdust, straw, leaves, pomace, and 

 the like. Under what conditions do you think it would pay to 

 plow under straw? 



In Chapter VI the general discussion of fer- 

 tilizer substances is continued, but in this case 

 the subject is commercial plant-foods. This is 

 a subject of very great importance, particularly 



