32 THE IDEAL SOIL 



2. Why do the roots of most farm and garden crops 

 grow most rapidly just at the bottom of the layer of soil 

 that is turned over by the plow? 



3. Name the most important kinds of soil. Collect 

 samples of each in your home locality. 



4. Why do some soils need draining? How are soils 

 drained? 



5. How does water enter drain tiles? 



6. What kind of soil is most affected by a drought? 



7. Tile drains near willow trees are often clogged by the 

 many roots that enter them. What do the roots seek? 



8. What conditions make an ideal soil? 



