Kew York Agricultural Experiment Station. 235 



could be bought at retail for cast in our large markets. These 

 prices also correspond (except in case of available phosphoric 

 acid) to the average wholesale prices for the six months pre- 

 ceding March plus about 20 per ct. in case of goods for which 

 there are wholesale quotations. 



Trade Values of Plant-Food Elements in Raw Materials and Chemicals. 



1899. 



Cents per 



pound. 



Nitrogen in ammonia salts 15 



Nitrogen in nitrates 12% 



Organic nitrogen in dry and fine-ground fish, meat and blood, and 



mixed fertilizers 14 



Organic nitrogen in cotton-seed meal and castor-pomace 12 



Organic nitrogen in fine-ground bone and tankage 14 



Organic nitrogen in coarse bone and tankage 10 



Phosphoric acid, water-soluble 4i/^ 



Phosphoric acid, citrate-soluble 4 



Phosphoric acid in fine-ground fish, bone and tankage 4 



Phosphoric acid in coarse fish, bone and tankage 2 



Phosphoric acid in cotton-seed meal, castor-pomace and wood ashes . . 4 

 Phosphoric acid in mixed fertilizers, insoluble in ammonium citrate 



and water 2 



Potash as high-grade sulphate, in forms free from muriates (chlor- 

 ides ) , in ashes, etc 5 



Potash in muriate 4^ 



COMPARISON OF SELLING PRICE AND COMMERCIAL VALUATION. 



Giving to the different constituents the values assigned in the 

 schedule for mixed fertilizers, 14 cents a pound for nitrogen, 4^ 

 cents a pound for water-soluble phosphoric acid, 4 cents a pound 

 for citrate-soluble phosphoric acid, 2 cents a pound for insoluble 

 phosphoric acid, and 4i cents a pound for potash, we can cal- 

 culate the commercial valuation, or the price at which the sep- 

 arate unmixed materials contained in one ton of fertilizer, hav- 

 ing the composition indicated in the preceding table, could be 

 purchased for cash at retail at the seaboard. Knowing the retail 

 prices at which these goods were offered for sale, we can also 

 readily estimate the difference between the actual selling price of 



