22 AGRICULTURAL EXPERIMENT STATION. [Jan. 



cost of these articles in the open markets. When the ex})eri- 

 ment was in operation this amounted to 15 cents per pound 

 for nitrogen, 5^ cents per pound for phosphoric acid and 4J- 

 cents per pound for potash. The net cost of a ration is that 

 cost remainino; after the value of the manure has l)een de- 

 ducted from the total cost. It is to be observed that the 

 vahie of the manure, i.e., its content of nitrogen, phosphoric 

 acid and potash, depends entirely upon the character of the 

 fodder articles fed. Thus, if the feed consists of corn meal 

 and hay, each of which articles have an obtainable manurial 

 value of about $5 per ton, the value of the manure will be 

 consideral)ly inferior to one where cotton-seed meal with an 

 obtainable manurial value of about $20 per ton or wheat bran 

 with an obtainable manurial value of $10 per ton are fed. 



All the concentrated feed stuffs, such as linseed meal, 

 cotton-seed meal, gluten meal, gluten feed and wheat bran, 

 have a very high percentage of nitrogen, which greatly 

 increases the value of the manure produced by the animal. 



* Cow consumed five pounds less hay per day during this period. 



