232 



SOILS AND FERTILIZERS 



will profit greatly. Sod, when plowed under, is frequently 

 planted to corn — a crop that is rarely injured by farm ma- 

 nure. Experiments in Illinois indicate the great response 

 of clover to farm manure, as compared with oats and corn. 



Table 54. — Increased Crop Yields and Values When Manure 

 Was Applied to Corn and Oats and to Clover 



QUESTIONS 



1. What plant nutrients does farm manure contain, and what 

 indirect fertilizing material ? 



2. In what ways is the organic matter of farm manure beneficial 

 to soils ? 



3. Which is richer in plant-food materials, liquid or solid 

 manure ? 



4. What constituent should farm manure have added to it in 

 order that it should be a well-balanced fertilizer ? 



5. What farm animal produces the largest quantity of manure 

 for every 1000 pounds of live weight ? 



6. Which produces the more valuable manure, a ration rich 

 in plant-food materials, or one poor in these substances ? 



7. Which of the farm animals furnishes a manure having the 

 greatest commercial value a ton ? , 



8. In what two ways does farm manure suffer loss on standing ? 



9. How is nitrogen likely to be lost by fermentation, and what 

 condition is likely to bring this about ? 



10. What substances are lost by the leaching of manure ? 

 What materials are used for conserving manure ? 

 Is it better to store manure, or to haul it directly to the land ? 



11. 



12. 



Why? 



13. 



Discuss the place of manure in the crop rotation. 



