^/>rz7 2, 1908.] Agricultural Gazette of N.SJF. 315 



portion of the tricalcic phosphate is converted into aiiother lime compound, 

 known as monocalcic phosphate or superphosphate. This compound is 

 sohible in water, and it is to its presence that the rapid action of the 

 phosphate is due. This is the " water-soluble "' acid of the table. In many- 

 superphosphates, however, a considerable portion of this compound has 

 undergone change. This change may be due to the salts of iron and alumina 

 present, or to the length of time it has been kept, and it results in the 

 formation of a third lime compound — bi-calcic pho-!i:)hate. This is known as 

 ' reverted " or " retrograde " phosphoric acid, and is insoluble in water, but 

 soluble in ammonium citrate. 



In the fourth table are a number of waste products whicli may in many 

 cases be economically utilised. 



When purchasing a manure always insist on a guarantee of its composition 

 as determined by analysis. 



Artificial manures should be mixed wdth aljout three times their weight of 

 dry loam, and distributed evenly. 



Never add lime to a manure containing sulphate of ammonia or blood and 

 bone manui-es, as in these cases loss of nitrogen results ; and -wdien lime 

 has been applied to the land do not use such manures until about three 

 weeks afterwards. 



The accompanying fertiliser diagram, which represents in a graphic manner 

 the points to be taken into consideration in the mixing of different manures, 

 is reproduced in the hope that it will be found useful to farmers who make 

 up their own mixtures. The diagram originates with Dr. Geekens, Alzey, 

 Germany, and is taken from an article by Mr. Leo. Buring in the Oarden 

 and Field of 10th October, 1903. 



■ n * ■- "^ 



j/s,r<o 



Chili Saltpet^^E, 



OR MTf^ATt OF r-OOS 



Sixbstances connected by thick line must not be mixed together. 



Substances connected by double line must only be mixed immediately before use. 



Substances connected by single thin line may be mixed together at any time. 



D 



