INSPECTION OF COMMERCIAL FERTILIZERS 45 



Citrate-soluble ("reverted") phosphoric acid is that part of the total 

 phosphoric acid in a fertilizer that is insoluble in water but soluble in a solution 

 of citrate of ammonia according to the method adopted by the A.O.A.C. 



Crude, inert, or slow-acting nitrogenous materials are unprocessed 

 organic substances relatively high in nitrogen but having a very low value as plant 

 food and showing a low activity by both the alkaline and neutral permanganate 

 methods (below 50% and 80%, respectively). 



Cyanamid is a commercial product composed chiefly of calcium cyanamid 

 (CaCN 2 ), and it shall contain not less than twenty-one per cent (21%) of nitrogen. 



DicaJcium phosphate is a manufactured product consisting chiefly of a 

 dicalcic salt of phosphoric acid. 



Dissolved bone is ground bone or bone meal that has been treated with sul- 

 furic acid. 



Dolomite is a mineral composed chiefly of carbonate of magnesium and calcium 

 in substantially unimolal (1-1.19) proportions. 



Dried blood is the collected blood of slaughtered animals, dried and ground 

 and containing not less than twelve per cent (12%) of nitrogen in organic forms. 



Dried, pulverized, or shredded manures are what the name indicates, and 

 not mixtures of manures and other materials. 



Fertilizer grade shall represent the minimum guaranty of its plant food ex- 

 pressed in terms of nitrogen (not ammonia), available phosphoric acid, and 

 water-soluble potash. 



Fish tankage, fish scrap, dry ground fish, fish meal fertilizer grade, is 



the dried ground product derived from rendered or unrendered fish. 



Garbage tankage is the rendered, dried, and ground product derived from 

 waste household food materials. 



Ground limestone (coarse-ground limestone) is the product obtained by 

 grinding either calcareous or dolomitic limestone so that all the material will pass 

 a 10-mesh sieve, and at least fifty per cent (50%) will pass a 100-mesh sieve. 



Ground raw bone is dried ground animal bones that have not been previously 

 steamed under pressure. 



Ground shells is the product obtained by grinding the shells of mollusks so 

 that not less than fifty per cent (50%) shall pass a 100-mesh sieve. The product 

 shall also carry the name of the mollusk from which said product is made. 



Ground shell marl is the product obtained by grinding natural deposits of 

 shell marl so that at least seventy-five per cent (75%) shall pass a 100-mesh sieve. 



Ground steamed bone is ground animal bones that have been previously 

 steamed under pressure. 



Gypsum, land plaster, or crude calcium sulfate are products consisting 

 chiefly of calcium sulfate. They may contain twenty per cent (20%) of combined 

 water. (They do not neutralize acid soils.) 



High calcic products are materials of which 90% or more of the total cal- 

 cium and magnesium content consists of calcium oxide. 



High magnesic products are materials in which more than 10 per cent of the 

 total calcium and magnesium oxide consists of magnesium oxide. 



Hoof and horn meal is processed dried, ground hoofs and horns. 



Hydrated or slaked lime is a dry product consisting chiefly of the hydroxide 

 of calcium and oxide-hydroxide of magnesium. 



Kainit is a potash salt containing potassium and sodium chlorides and some- 

 times sulfate of magnesia with not less than twelve per cent (12%) of potash 

 (K 2 0). 



