FARM MANURES 



159 



about 75 per cent of water. The nitrogen varies from 

 0.4 to 0.9 per cent, according to the nature of the food 

 and the extent to which other factors have affected the 

 composition. In general, animals consuming liberal 



2A&. 



FIG. 34. Average Composition of Fresh 



Manure. 



I. Nitrogen. 2. Phosphoric acid. 

 3. Potash. 4. Mineral matter. 



FlG. 35. Manure after Six 

 Months' Exposure. 



amounts of coarse fodders produce manure with a 

 higher per cent of potash than of phosphoric acid. 

 This is because the potash in the food exceeds the 

 phosphoric acid. Farm manures also contain lime, 

 magnesia, and other minerals present in plants and 

 designated as essential ash elements. The average 

 composition of mixed stable manure is as follows : 



