VI. 



MANURING AND GENEEAL MANURES 



113 



Nitrogen 



Potash 



Phosphorus pentoxide 



0-16 per cent. 



0-08 



0-04 



Farm-yard manure consists usually of the mixed excrements of the 

 animals of the farm, together with the litter used for their bedding. 

 To it are added any waste organic matters occurring near the farm- 

 stead, including animal offal of various kinds, vegetable refuse, and, too 

 often, the waste matter from the thrashing machine, which often con- 

 tains the seeds of weeds. 



According to German authorities, the average amount of manure 

 yielded per day per head by the various animals of the farm, may be 

 taken as the following : 



American l estimates are much higher : 



The composition of the manure produced on a farm must vary 

 considerably owing to a great number of varying conditions. It is 

 obvious, therefore, that any particular analysis is of little value as a 

 means of judging of the nature of manure produced in other cases. 

 Large numbers of analyses have been published, some showing, in great 

 detail, the substances present. An often quoted series of analyses of 

 farm-yard manure was made by Voelcker many years ago. 



A summary of his results, as quoted by Storer, 3 is here given : 



1 Bull. 27 of the New York Cornell Station. 



2 The horses were working. The quantities are estimated on the assumption 

 that three-fifths of the manure was collected. 



3 Agriculture, etc., Vol. I, p. 521. 



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