84 



FARM MANURES, AND SIMILAR MATERIALS 



Composition of litter. 



One ton contains in pounds 



Poultry manures. 



Poultry manures are richer than the other farm manures when well 

 preserved. There are two principal reasons for this : First, the food 

 is richer, as a rule ; and second, the excretion corresponding to the urine 

 of the larger domestic animals is semi-solid, voided with the dung, and 

 not subject to direct loss. Poultry manures as a rule are rich hi nitro- 

 gen and phosphoric acid, because the foods given the fowls are rich 

 in these elements. These manures are relatively poor in potash, al- 

 though they may contain a larger percentage of this element than 

 do the other farm manures. The composition is subject to wide 

 variation. The table shows the results of analyses : 



