12 



4. Describe what jou understand by thorough orchard tillage. 



5. In what respect does the orchard (fruit trees) differ from the 

 wheat crop ? 



6. Why is it unwise to grow cereal crops in an orchard ? 



7. Name two purposes which the orchard cover-crop is su]:)])osed 

 to serve. 



8. What advantage has the leguminous plant over the non-legumi- 

 nous plant wlien used as a cover-crop ? 



9. If you are in need of nitrogen, unable to obtain barnyard 

 manure, tankage, or (jtlier animal refuse and do not care to use 

 chemical fertilizers, what miii-ht vou do? 



10. Name three nitrogen " collectors." 



11, Name three nitrogen ''consumers." 



12. What is a superphosphate ? 



13. What should be added to green manures to make a balanced 

 plant-food ration ? 



400 



