BULLETIN No. 140. DECEMBER 1911. 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



INSPECTION OF 



COMMERCIAL FERTILIZERS 



BY 



H. D. HASKINS, L. S. WALKER, J. F. MERRILL and R. W. 



RUPRECHT. 



This bulletin gives a detailed report of the fertilizer inspection 

 for 191 1. It gives the full text of the new fertilizer law recently 

 enacted, states the number of fertilizers inspected, gives trade 

 values of fertilizer ingredients, provides a summary showing aver- 

 age 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, particularly with reference to the activity of the 

 organic nitrogen. Tables of analyses give the detailed composition 

 of all fertilizers sold in the state. 



Requests for bulletins should be addressed to the 



Agricultural Experiment Station, 



Amherst, Mass. 



