580 



BOARD OF AGRICULTURE. 



[Jan. 



Potash Fertilizers. 



[I. Muriate of Potash. II. Sulphate of Potash and Magnesia, sent on from 

 Amherst, Mass.l 



Saltpetre Waste from Gunpowder Works. 



[Seat on from Acton, Mass.] 



Per cent. 



Moisture at 100° C , 5.19 



Potassium oxide, 15.04 



Sodium oxide 36.82 



Total calcium oxide, .47 



Total magnesium oxide, .27 



Nitrogen, 1.90 



Sulphuric acid, 1.02 



Total chlorine 63.50 



Calcium chloride, .05 



Magnesium chloride, .63 



Insoluble matter, Trace. 



The composition of this material varies in different samples 

 in a marked degree. Its application on forage crops and on 

 grass lands in particular has proved highly satisfactory. 



