56 



EXPERIMENT STATION. 



[Jan. 



Table showing lire Pound Cost of Nitrogen^ Potash and the Various 

 Forms of Plionphoric Acid in ilie Three Grades of Fertilizer. 



Nitrogen, 



Potash (as muriate), 

 Soluble phosphoric acid. 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid, 



Low-grade 

 Fertilizer 

 (Cents). 



3(;.eo 



7.71 

 e.74 

 3.85 



Medium-grade 

 Fertilizer 



(Cents). 



31.08 

 S.18 

 C.H 

 f..73 

 3.27 



High-grade 

 Fertilizer 



(Cents). 



26.85 

 7.07 

 5. 65 

 4.95 

 2.83 



The above tal)le shows : — 



1. That nitrogen has cost 9.75 cents more per pound, avail- 

 al)le phosphoric acid about '2 cents more ]»er jxiimd and potash 

 2.5G cents more per pound in the average low-grade fertilizer 

 than in the average high-grade goods. 



2. That nitrogen has cost 4.23 cents, the available phosphoric 

 acid over •V^ of a cent and the potash 1.11 cents more ])er ponnd 

 in the average medinm-grade fertilizer than in the average high- 

 grade goods. 



o. That every conclusion which can be drawn from the above 

 table emphasizes the fact that the farmer cannot aibird to pur- 

 chase low-grade fertilizers. 



(7;) Vnivixed Ferlilizcrs;. 



Ground Bones. — Twenty-nine samples of ground bone have 

 been analyzed dnring the inspection of 1009. Eleven of the 

 brands have been found deficient in ])hosphoric acid and 8 in 

 nitrogen; 8 brands had a commercial shortage ranging from a 

 few cents to $2.95 per ton. The average retail cash price for 

 bone has been $30.-39 per ton, the average valuation $2G.09 

 and the percentage difference KJ.oT. 



Tanlmge. — Nine samples of tankage have been analyzed 

 and show the nsnal variations in composition; only 1, however, 

 has shown a serious shortage in nitrogen, and 4 tested low in 

 phos]:>horic acid. There were no commercial shortages. The 

 average retail cash price was $30.18, the average valuation 

 $29.8(1 ai.d I he ]ici'ceiitage difference l.OT. The average cost 



