FARMING AND FERTILITY 1 21 



EXERCISES 



Secure the latest available report of the live-stock census and crop 

 reports for your county or township, and determine and prepare a 

 table showing the following : 



1. The number of acres of each of the leading grain crops. 



2. The total yield in your county of each of the leading crops. 



3. The average acre-yield of each of the leading crops. 



4. The number of animals of each of the leading kinds. 



5. The total value of the manure produced by the live stock in 

 one year. 



6. The average value of this manure per acre. 



7. The total amount of nitrogen, phosphorus, and potassium 

 removed from the soil (i) by the grain crops, (2) by the hay crops, 

 and (3) by both. 



8. The total value, at prices used in the text, of these elements 

 removed. 



9. The value of these elements per acre. 



10. If all the manure were returned to the land each year, what 

 would be the loss per acre of land through removing the crops ? What 

 would it be if only half the manure were put upon the land ? 



REFERENCES 



LONG and PERCIVAL. Common Weeds of Farm and Garden. Frederick 



A. Stokes Company. 



PAMMEL, L. H. Weeds. Orange Judd Company. 

 SHAW, THOMAS. Weeds and how to Eradicate them. Webb Publishing 



Company. 

 SNYDER, HARRY. Soils and Fertilizers, chap. xii. Chemical Publishing 



Company. 



THORXE, C. E. Farm Manures, chap. xiii. Orange Judd Company 

 WARREN, G. F. Farm Management, chap. v. The Macmillan Company. 

 WHITSON and WALSTER. Soils and Soil Fertility, chaps, v, xviii, xix, 



and xx. Webb Publishing Company. 

 Planning a Cropping System, Bulletin 102, Pt. Ill, Bureau of Plant 



Industry, United States Department of Agriculture. 

 Farm Management, Bulletin 2j6, Bureau of Plant Industry, United States 



Department of Agriculture. 

 Replanning a Farm for Profit, Farmers' Bulletin j/o, United States 



Department of Agriculture. 



