(72) EXERCISE 27 (Continued) 



QUESTIONS 



1. What is soil ventilation? 



2. What is the effect of compacting the soil on the germination of the seeds? 



3. What effect did the wet condition of the soil have on the germination and 



growth? 



4. Is either compactness or excess of water likely to occur in sandy soil? 



5. What would be the effect of tile drainage on soil aeration in a heavy clay 



soil? 



6. Name the different forces which serve to change the air in the soil. 



7. Of what importance is ventilation to the bacteria which live on clover 



and alfalfa roots? 



8. What relation has ventilation to the decay of organic matter in the soil? 



9. State clearly why soil ventilation is important. 



