138 



THE SUGAR BEET. 



explained, but as it contains 13 per cent, of nitrogen 

 and 45 per cent, of potassa, on soils where both of these 

 are wanting advantage may be derived ; but, as a gene- 

 ral thing, most of those of ordinary fertility are suffi- 

 ciently rich, and they should consequently seldom be 

 used. Of late years experiments have been made to 

 ascertain the possibility of substituthig soda for potassa, 

 and it is now admitted that the plan is feasible, and 

 that good results may be expected if chloride of sodium 

 is added. This will, however, yield poor roots for 

 manufacturing purpose. 



Calcareous Fertilizers. — We have before had occa- 

 sion to explain the varions chemical changes that take 

 place on calcareous soils which are, as a general thing, 

 advantageous to the growth and quality of the root. 

 When calcium is wanting it becomes evident that 



of France and Italy, to ascertain if there existed any relation between the 

 amount of potassa and the sugar the beet contained. 



From these experiments it becomes doubtful if potassa is possessed of any of 

 the attributed qualities. 



