302 LEGUMES AND FERTILIZERS 



8. Give reasons for the home mixing of fertilizers. 



9. How can you ascertain the kind of fertilizers needed by a soil? 



10. What are the chief forms and sources of phosphoric acid? 



11. What are the chief forms and sources of potash? 



12. Enumerate the benefits from the use of lime on soils. 



13. What other material should be added also? Why? 



14. Compare the use of ground limestone with fresh-burned lime. 



15. Tell when and how to use lime. 



16. Give the benefits of deep tillage. 



17. Give reasons for fall plowing. 



18. Discuss repacking after plowing. 



19. How is a soil mulch maintained? 



20. What are its benefits in the garden and orchard? 



21. What methods of soil maintenance or improvement are practiced in your 



region? 



22. State which formula expresses the higher grade of fertilizer. 2-5-4 or 3-8-8. 



Give reasons for your answer. 



References. — U. S. Farmers' Bulletins: 339, Alfalfa; 455, Red Clover; 

 515, Vetches; 579, Utilizing Crimson Clover; 646, Crimson Clover Seed; 690, 

 Field Pea; 693, Bur Clover; 716, Management of Sandy Lands; 757, Commev- 

 cialVarieties of Alfalfa, 761, Management of Muck Land; 805, Drainage of Irri- 

 gated Lands; 820, Sweet Clover: Utilization; 836, Sweet Clover: Harvesting; 

 865, Irrigation of Alfalfa; 882, Orchard Irrigation; 921, Principles of Liming 

 of Soils; 931, Soybeans in the Cotton Belt; 978, Barnyard Manure; 1143, 

 Lespedeza; 1148, Cowpeas; 1121, Alsike Clover. 



The Fertility of the Land, Roberts, Macmillan Co.; Crops and Methods 

 for Soil Improvement, Agee, Macmillan Co; Manures and Fertilizers. 

 Wheeler, Macmillan Co. 



