MANURE. 



155 



Increase ot grain by manure, No. 3 being = lOOO". 



1. 1382 lbs. 



2. 962 " 



Increase of straw, by manure : 



1. 1381 lbs. 



2. 985 " 



It is evident that the salts alone of manure do not mee\. 

 the wants of the farmer. 



Numerous experiments, proving the inefficacy of salts 

 without nitrogenous and organic matters, might here be cited. 

 They would confirm only the experience of practical farmers. 

 It may be useful to state what is the composition of the 

 ashes of several excrements, as determined by Mr. J. Rogers. 



When it is said that nitrogen measures the value o. ma- 

 nure, it must be remembered that the nitrogen should exist 

 as ammonia, or in a state of combination which permits its 

 ready conversion into ammonia. 



It is the result equally of chemical and agricultural expe- 

 rience, that salts are decomposed with more or less ease, 



