REVIEW QUESTIONS 



CHAPTER I 



I. Why is the classification of plants of interest to the student 

 of farm crops ? What is a species, variety, genus, family, order, 

 class and division ? 



II. Discuss some of the variations found within the plant 

 kingdom, in regard to (a) size, (b) structure, (c) habitation, 

 (d) food requirements, (e) usefulness to man of the various plants. 



III. How may one determine the proper classification of an 

 individual plant? How does the botanical name assist one in 

 identification ? 



IV. How may plants be classified with respect to their length 

 of life, their usefulness to man and their culture ? What are 

 field crops, and how may they be classified ? Name several 

 members of each group. Discuss the relative importance of 

 each group of field crops. 



CHAPTER II 



I. (a) What is meant by the term " rotation of crops " ? 

 (6) What is meant by the term "continuous culture"? 



II. Compare yields of wheat obtained from rotation and con- 

 tinuous culture at Rothamsted. The same for barley. 



III. What effect has continuous culture had upon the yield 

 of corn at the Illinois Station ? At the Ohio Station ? 



IV. Compare results obtained at the Ohio Station with corn 

 and wheat fertilized and unfertilized in continuous culture. 

 Make same comparison in rotation culture. 



V. Why do rotations of crops give better yields than con- 

 tinuous culture ? Give six reasons. 



VI. What factors must be considered in planning a rotation ? 



VII. Does rotation alone maintain the fertility of the soil? 

 Why? 



VIII. Give eight rotations commonly recommended. 



403 



