176 MASS. EXPERIMENT STATION BULLETIN 155. 



Analysis. 



Calcined FJiospJiate (No. 6). — Calcined phosphate, as the 

 name indicates, is a manufactured product, high calcination 

 being a part of the process. It is represented to be made under 

 the so-called Newberrj-Fishburne process, which, briefly stated, 

 is as follows : — 



A 30 to 32 per cent, phosphate rock is mixed with 15 to 20 

 per cent, of an alkaline salt. The mixture is heated in rotary 

 kilns to a high temperature. During the process most of the 

 salt is volatilized. The resulting porous clinker is pulverized 

 and ground to a fine condition suitable for a fertilizer. The 

 product gives a mild alkaline reaction. 



Unpublished results at the Ohio and Indiana Experiment 

 stations indicate that this material furnished phosphoric acid 

 in an available form. The writer has not heard of the product 

 being generally quoted in the fertilizer trade, and its cost is 

 therefore not known. 



Calcium Cyanamid (No. 7). — Calcium cyanamid, now gen- 

 erally handled in the trade under the name cyanamid. although 

 not a new product is but rarely used by the farmer except as 

 a part of commercial mixed fertilizers in which it is now not 

 infrequently used. It is said that most of it is now bought by 

 the fertilizer manufacturers. In view, however, of the large 



