FOOD CONSUMED TO MANURE PRODUCED 1 49 



ments from hog^s when fed on different amounts of 



gram 



56 



The amount of waste matter in the urine is nearly 



J 



the same whether an animal be gaining or losing in 

 flesh, consequently the urine is more constant in both 

 composition and quantity than the solid excrements. 



The amount and composition of the solid excre- 

 ments vary with the amount and kind of food con- 

 sumed. If the food is indigestible the solid excrements 

 contain a larger part of the nitrogen as indigestible 

 protein. When the body is properly supplied with 

 food for all purposes, normal conditions exist, and the 

 amount of nitrogen voided in the liquid and solid ex- 

 crements is no more than that supplied in the food 

 consumed. 



178. Manurial Value of Foods. — The manurial 

 value of fodder is determined by the amount of nitro- 

 gen, phosphoric acid, and potash present in the material. 

 Timothy hay, for example, has a manurial value of 

 $5.30 per ton, which means that if the nitrogen, phos- 

 phoric acid, and potash in the timothy hay were pur- 

 chased in commercial forms they would cost $5.30. 

 Lawes and Gilbert estimate that 80 per cent, of the 

 fertility in fodders is, as a rule, returned in the ma- 

 nure. 



In the following table are given the pounds of 

 nitrogen, phosphoric acid, and potash per ton of ma- 

 terial : 57 



