270 



FeedJt and Feeding. 



tion of majQure by farm ?i.TiiTna,1a maintained under average condi- 

 tions: 



Fertilizing constituents in solids and liquids voided by farm animals, 

 daily and yearly — Various sources, Roberts. 



Horse (Hebert) 



Cow 



Sheep (Miintz and Girard) 

 Pig (Boussingault) 



Value 



per 



year. 



$24.06 



32.25 



2.29 



3.06 



* Estimated. 

 424. Value of farm manure per ton. — Eoberts, gathering the 

 data at Cornell Station and elsewhere, deduces the following as 

 the average value per ton of manures from various farm animals, 

 nitrogen being rated at fifteen cents, phosphoric acid at seven 

 cents and potash at four and one-half cents per pound: 



Value per 

 ton. 



Horse $2.49 



Cow 2.43 



Sheep 4.25 



Pig 3.20 



It should be borne in mind that the value of farm manures de- 

 pends primarily upon the character of the feed given, and, in the 

 second place, upon the animal to which the feed is supplied. 

 Manure which originates from the use of concentrated feeding 

 stuffs usually has a high value, because such feeds are rich in 

 nitrogen, phosphoric acid and potash. Manure resulting from 

 the use of straw and coarse forage has a correspondingly low 

 value. ' 



' The student desiring additional information on matters treated in this 

 chapter should consult: The Fertility of the Land, Roberts; Agriculture 

 in Some of its Relations with Chemistry, Storer. 



