QUESTIONS 79 



In a former book the author made the following summarized 

 statement on the object of intertillage for corn 5 : " We may there- 

 fore conclude from the data presented that up to the time when corn 

 shades the ground, and the field is comparatively fallow, cultivation 

 conserves some moisture as in any fallow soil. After the corn crop 

 is thoroughly established and a layer of surface roots intercepts 

 capillary moisture from below, the principal service of cultivation is 

 to destroy weeds." 



QUESTIONS 



1. Describe the evolution of tillage tools. 



2. Give'the two most important reasons for tillage. 



3. Compare the loss of water by evaporation from a bare field and a 



field in crop. 



4. What appears to be the most important reason for cultivation in a 



corn field? 



5. Name cultivated crops where cultivation would probably be more 



necessary than in corn. 



6. How should depth of cultivation be regulated? 



7. How frequently may corn be cultivated with profit? 



5 Corn Crops, p. 212. 



