92 Experiment Station Report. 



cial fertilizers, and of prominent refuse materials from manu- 

 facturing industries and elsewhere. 



The work has been carried on for the purpose of aiding 

 the farming community in a clear and intelligent apprecia- 

 tion of these substances for manurial purposes. 



General experience in farm practice teaches that it is safer, 

 for economical reasons, to use commercial fertilizers rather 

 as supplements than as substitutes for barn-yard manures. 



The advanta<?es arisino^ from the introduction of chemical 

 and commercial manurial substances can only be secured to 

 their full extent when applied with reference to actual local 

 wants of the soil, and to special requirements of the crops 

 under cultivation. 



A large percentage of commercial manurial material con- 

 sists of refuse matter from various industries. The compo- 

 sition of these substances depends on the mode of manufac- 

 ture carried on. The rapid progress in our manufacturing 

 industry is liable to affect at any time, more or less seri- 

 ously, the composition of the refuse. A constant inquiry 

 into the character of the agricultural chemicals, and of com- 

 mercial manurial refuse substances offered for sale, cannot 

 fail to secure confidence in their composition, and diminish 

 financial disappointment in consequence of their applica- 

 tion. 



Trade Values Adopted for 1883. 



Cents per lb. 



Nitrogen in nitrates, 20 



Nitrogen in ammonia salts, 26 



Nitrogen in Peruvian guano, fine steamed bone, dried and 



fine ground blood, meat and fish, superphosphates 



and special manures, 23 



Nitrogen in coarse or moist blood, meat, or tankage, in 



cotton-seed, linseed, and castor pumice, ... 18 



Nitrogen in fine ground bone, horn, and wool dust, . 



Nitrogen in fine medium bone, 



Nitrogen in medium bone, 



Nitrogen in coarse medium bone, .... 

 Nitrogen in coarse bone, horn shavings, hair, and fish 



scrap, . 



Phosphoric acid, soluble in water, .... 

 Phosphoric acid, " reverted," and in Peruvian guano. 

 Phosphoric acid, insoluble, in fine bone, fish guano, and 



superphosphates 



17 

 15 

 14 

 13 



11 



11 



