column, the corresponding prices per ton; in the third ^^^^ ^^^ 

 column, the cost of the contained ammonia per pound, a ^°^^ 

 figure which is always discussed, but almost never explained ^^S 

 in Station Bulletins; in the fourth column, the equivalent 

 price of the Ammonia per ton unit, and in the fifth column, 

 gives the corresponding prices of the cost of the Nitrogen 

 per pound, a figure also much discussed, but not explained 

 in Bulletins. The important figures to remember are the 

 price per hundred weight, the price per ton and the equiv- 

 alent price of the ammonia in the Nitrate per ton unit. The 

 table IS prepared to cover fluctuations in price running from 

 one dollar and eighty cents per hundred, to tivo dollars and 

 seventy cents per hundred; or from thirty-six dollars, to fifty- 

 four dollars per ton. 



From New Jersey Agricultural 

 Experiment Station. 



Bulletin 172. 



The Use of Fertilizers. A Review of the Results of 

 Experiments with Nitrate of Soda. 



Professor Edward B. Voorhees. 



The Use of Fertilizers. 



Great gains have been made in the past few years in our 

 knowledge of the necessity of using, and in the methods of 

 use of, commercial fertilizers. A point of primary impor- 

 tance that has been learned is that their application is neces- 

 sary for the most profitable culture of many of the crops 

 grown, not only in the East and South, but also in sections 

 of the country where it was formerly believed that the 

 natural fertility of the soil would suffice for many genera- 

 tions. Their use has spread from the States of the East 

 and South to those of the Middle and Northwest and Pacific 

 slope — Wisconsin, Colorado, Minnesota and California now 

 use many tons annually. The question as to the need of 

 fertilizer settled, the next in importance is how to use the 



