EXPERIMENTAL STATIONS — REPOrvT FOR 1880. 



353 



so far as the phosphate of the manure is concerned, and if only 

 the amount of nitrocren contained in the dissolved bones is 

 supplied to the superphosphate in the form of ammonia salts, or 

 other equally good nitrogenous manure, the effect upon the crop 

 may reasonably be expected to be the same. 



A minute analysis was made of the ash of the grain of the 

 first twelve plots, and also plots 28, 29, and 30, in order to 

 determine what effect the use of dissolved manures might have 

 upon the amounts of phosphoric acid and potash absorbed by 

 the grain. The amounts of soda and silica were also determined, 

 with the following results : — ■ 



Analysis of Ash of Grain. 



Undissolved Phosphates. 



Plot. 



1 

 3 



5 



7 

 9 



Bone ash .... 



Ground coprolites 



Bone dust .... 



Phosphatic guano 



Ground Cura9oa phosphate 



Average 



Phosphoric p^^^^^ 

 Acid. 



Soda. Silica. 



37-28 

 36-44 

 36-09 

 34-74 

 36-^5 



36-16 



24-23 



25-57 

 25-06 

 24-15 

 25-92 



24-98 



Dissolved Phosphates. 



2 

 4 

 6 

 8 

 10 



Bone ash . 

 Ground coprolites 

 Bone dust . 

 Phosphatic guano 

 Ground Cura9oa pho: 



phate 



36-54 



32-09 

 36-02 

 37-54 

 35-82 



Average 



35-60 



23-29 



4-65 



24-32 

 24-59 

 25-29 

 24-02 

 23-29 



24-30 



Superphosphates. 



27 

 28 

 29 



10 per cent, soluble 



20 



30 



)> 



»> 



37-03 

 36-29 

 33-67 



25-81 

 23-38 

 25-00 



6-97 

 6-32 

 3-66 



23-92 

 24-26 

 23-49 



A comparison of these figures shows the unexpected result, 

 that the barley grown with dissolved phosphates lias taken up 

 a less proportion of phosphoric acid and potash than that grown 

 with undissolved phosphates ; and this is borne out by the 

 superphosphate plots, which show that according as the solu- 



z 



