J14 



Agricultural Chemistry. 



nures ; ' ' that is, they are manures which heat slowly because the 

 high water content checks fermentations. Sheep and horse ma- 

 nure are known as "hot manures, " due to a lower water content 

 which is favorable to a more rapid fermentation. 



Amount and value of manure from different anitnals. It is 

 sometimes important for the farmer to know the total amount 

 and value of the manure produced in a year by the different farm 

 animals. In the following table such data are brought together, 

 with the amount of manure calculated to the same live weight 

 of the various animals. 



Amount and Value of Manure per 1000 Ibs. of Live Weight of 

 Different Animals. 



If these figures are accepted as representing normal conditions, 

 it follows that the sum of thirty dollars may be taken as repi 

 senting the average value of the fresh manure from each II 

 pounds of live weight. The use of this factor (thirty dollars pei 

 1000 pounds) will enable the student to calculate approximate!? 

 what the nitrogen, phosphoric acid and potash in the manui 

 produced on his farm would cost,* if purchased in commercial 

 fertilizers, granting of course that the manure is so managed as 

 to prevent loss of its valuable constituents. 



*A11 the valuations i^ the calculations made are based on 15 cents per 

 pound for nitrogen and 5 cents per pound for phosphoric acid and for 

 potash. This represents in round numbers the market price of these in- 

 gredients in commercial fertilizers at the present time. 



