BULLETIN No. 147. DECEMBER 1913. 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



INSPECTION OF 



Commercial Fertilizers 



BY 



H. D. HASKINS, L. S. WALKER, C. P. JONES and W. S. FROST 



This bulletin gives a detailed report of the fertilizer inspection 

 for 1913. It states the number of fertilizers inspected, gives trade 

 values of fertilizer ingredients, provides a summary showing average 

 composition of unmixed fertilizing material as well as pound cost of 

 each element of plant food furnished. Special attention is called to 

 commercial shortages existing in both unmixed fertilizing materials 

 and mixed goods. Particular emphasis is laid upon the economy of 

 purchasing only high grade fertilizers. A summary table shows the 

 general standing of each manufacturer's brands. A discussion is 

 made of the quality of plant food found present in the mixed goods. 

 A summary table shows the general quality of nitrogen found Jn 

 each manufacturer's product. A brief statement of a field experi- 

 ment is given to show the actual crop producing power of the 

 "New Mineral Fertilizer" and other stonemeal products. Mention 

 is made of the number and nature of the lime products analyzed. 

 Tables of analyses give the detailed composition of all fertilizers and 

 lime products sold in the state. Commercial valuations of the plant 

 food in all fertilizing materials, calculated from the table of trade 

 values, are published, and for the lime compounds, the actual cost of 

 100 pounds of calcium and magnesium oxides is given in each case. 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION, 



AMHERST, MASS. 



