328 PRINCIPLES OF FEEDING FARM ANIMALS 



ing the amounts of these elements in the feeds, one may 

 multiply them by the per cent of each recovered in the 

 manure and obtain the amount of fertilizing constituents. 

 Then multiplying the amount of each by the market price 

 of that constituent and adding all together gives the fer- 

 tilizing value of the feed when fed to farm animals. This, 

 of course, does not take into consideration the value of the 

 organic matter of the manure as a source of humus in the 

 soil. Assuming nitrogen as worth 15 cents per pound, phos- 

 phorus, 10 cents per pound, and potassium, 6 cents per pound, 

 which is about what one generally has to pay for these con- 

 stituents in commercial fertihzers, the ordinary feedingstuffs, 

 after passing through the animals, have the following values 

 as fertilizers : 



Table 27. — Value of Fertilizing Elements in Manure from 

 Feedingstuffs 



Corn .... 

 Oats .... 

 Wheat . . . 

 Soybeans . . 

 Tankage . . . 

 Linseed meal . 

 Cottonseed raeal 

 Wheat bran 

 Wheat middlings 

 Clover hay . . 

 Alfalfa hay . . 

 Timothy hay . 

 Oat straw . . 

 Corn stover 



Value per 

 Ton 



$9.80 



31.00 



14.80 



20.20 



10.00 



9.80 



8.00 



8.40 



2.20 



3.20 



2.80 



