304 



Manures, Composts, Green Manures 



Table 65. Chemical Composition of Various Fresh Manures 

 (from Waksman and Diehm) 



On basis of drv, litter-free material. 



* Solid and liquid excreta. 

 f Solid excreta only. 



or the most important nutrients required for plant growth. Cattle 

 and horse manures contain the lowest quantities of these essential 

 ingredients. 



On the basis of numerous analyses, stable manure is found to 

 contain, in a fresh state, about 70-80 per cent water, 0.3-0.6 per 

 cent nitrogen, 0.1-0.4 per cent phosphorus as P2O5, 0.3-1.0 per cent 

 potassium as KoO. A ton of fresh manure thus carries about 400-600 

 pounds of dry matter; about 10 pounds is nitrogen, 6 pounds P2O5, 

 and 10 pounds potash. About half the nitrogen and a large part of 

 the other two elements are in water-soluble forms and are thus 

 immediately available for plant growth. 



Cow manure and horse manure are about equal in nutritive value 

 to plants and as sources of humus. To eliminate certain undesirable 

 characteristics of fresh stable manure, to destrov the weed seeds 



Table 66. Chemical Nature of Different Manures (from Jenkins) 



Composition of Dry Matter 



