56 



EXPERIMENT STATION. 



[Jan. 



Table showing the Pound Cost of Nitrogen, Potash and the Various 

 Forms of Phosphoric Acid in the Three Grades of Fertilizer. 



The above table shows : — 



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

 able phosphoric acid about 2 cents more per pound and potash 

 2.56 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 phos])horic 

 acid over ^ of a cent and the potash 1.11 cents more per pound 

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

 grade goods. 



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

 table emphasizes the fact that the farmer cannot ali'ord to i)nr- 

 chase low-grade fertilizers. 



(Ji) Unmixed Fertilizers. 



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

 been analyzed during the inspection of 1909. Eleven of the 

 brands have been found deficient in phosphoric 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 $20.09 

 and the percentage diiference ]t).57. 



Tanlxoge. — Nine samples of tankage have been analyzed 

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

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

 phosplioric acid. There were no commercial shortages. The 

 average retail cash price was $30.18, the average valuation 

 $2t).8() aiid the ix'rci'utagc diirereiice 1.07. The average cost 



