280 BOARD OF AGRICULTURE. 



APPENDIX. 



Composition of some Compounds in Fertilizers. 



100 parts of nitric acid contain 26 parts nitrogen. 

 " of ammonia " 82.35 " " 



" of nitrate of potassa contain 46.6 parts potassium oxide. 

 " " " (or saltpetre) contain 53.4 parts nitric acid. 



" of nitrate of soda contain 36.75 parts sodium oxide. 

 " " " (Chili saltpetre) contain 63.25 parts nitric acid. 



" of sulphate of potassa contain 54.9 parts potassum oxide. 

 " " " " 46.0 parts sulphuric acid. 



" of sulphate of lime (free of water) contain 41.0 parts calcium 



oxide (lime). 

 " of sulphate of lime (free of water) contain 59 parts sulphuric 



acid. 

 " of sulphate of lime (with water, gypsum) contain 32.5 parts 



calcium oxide (lime). 

 " of sulphate of lime (with water, gypsum) contain 46.5 parts 



sulphuric acid. 

 " of sulphate of lime (with water, gypsum) contain 21 parts 



water. 

 " of bone phosphate (or tricalcic phosphate) contain 54 parts 



calcium oxide (lime). 

 " of bone phosphate (or tricalcic phosphate) contain 46 parts 



phosphoric acid. 

 " of carbonate of lime contain 56 parts calcium oxide (lime). 

 " " " " 44 parts carbonic oxide. 



" of chloride of potassium contain 52.4 parts potassium. 

 " . " " " 63.1 parts potassium oxide. 



" " " " 47.6 parts chlorine. 



