INSPECTION OF COMMERCIAL FERTILIZERS 



49 



The followiufi; tables show the yield of dry matter and the nitrogen recovered 

 in the above-ground parts of the ]ilant; and the nitrogen availability of each 

 product on the basis of yield of dry matter and on the basis of nitrogen recovery, 

 from the standpoint of both total nitrogen, Series I, and water insoluble nitrogen, 

 Series II. The yield from Dried Blood placed at 80 is used as the standard of 

 comparison. The tables also show the activity of the total and water insoluble 

 nitrogen in each fertilizer ])roduct as measured by laboratory methods. 



Series I. — Unwashed, (a) 



(o) By "unwashed" is meant the original ground material furnished to the trade: "washed" 

 designates each product largely freed from water soluble nitrogen by successive washings with 

 water. 



(6) The nitrogen in the fertihzer was mostly soluble in water. 



(c) Double amount of nitrogen used. 



(d) Potash and phosphoric acid 3^ more than the usual quantity. 



