FACTORS IN WHEAT PRODUCTION 121 



may these pests be controlled ? Infer the significance of 

 the term rust. 



6. In general what is true of the size of farms where 

 commercial wheat is produced ? 



7. What relation exists between density of population, 

 size of farms, and export of wheat ? 



8. About what is the average size of farms in your locality 

 or state ? 



9. What machinery is used in wheat production in your 

 home region ? Find cost of equipment and compare with 

 that given in the text. 



10. Account for the fact that wheat may be a profitable 

 crop in regions where the yield is very low. 



11. By what methods may the wheat yield in a given 

 locality be increased ? 



12. What are some of the advantages and disadvantages 

 of extensive wheat farming ? 



13. By inquiry find the approximate cost of wheat pro- 

 duction in your locality and compare with that given in the 

 published tables. 



