202 FA11M MANAGEMENT 



selling butter, much less than half the fertility of the 

 feed ever reaches the fields. It rots and wastes away 

 around the barns, and is lost where cows stand in the 

 pasture creek, or where they congregate in the corner or 

 under trees. Arguments against selling milk assume that 

 when the skim-milk is fed to hogs, the fertility is all 

 saved. It would be interesting to know just how many 

 acres in America have been manured with hog manure. 

 There is no merit in not selling anything. Most farmers 

 sell too little. What to sell and what to buy and what 

 is the best way to keep up fertility can never be solved by 

 formulas. 



REFERENCES 



The Principle of Soil Management, Lyon and Fippin. 



Soil Fertility and Permanent Agriculture, C. G. Hopkins. 



Soils, S. W. Fletcher. 



First Principles of Soil Fertility, A. Vivian. 



Elements of Agriculture, G. F. Warren, pp. 60 to 153. 



