Notes upon Celery. 



229 



alone 4.40 per cent, was found in the plant as against 2.84 per 

 cent where nitrate of soda was used with the potash. Phosphoric 

 acid and lime seem to be quite constant. 



" While no conclusive result can be drawn from this one set 

 of analyses it seems probable that nitrogen and potash are the 

 plant-foods most required." 



ANAI.YSES OF Celery Plants. 



It is apparent that these figures throw little light upon the rea- 

 sons for our curious results, — the high yield with potash and the 

 very small yields with nitrogen. It was then decided to make an 

 analysis of the soil, to find if its composition could aid in inter- 

 preting the results of the experiment. The soil was found to show 

 no acidity. Mr. Cavanaugh found a very high content of nitrogen, 

 phosphoric acid and potash. It was then suggested that the pot- 

 ash, whilst large in amount, might be unavailable. Accordingly, 

 the potash and phosphoric acid were tested for availability, when 

 it was found that the potash was practically all unavailable whilst 

 the phosphoric acid was in a very available condition (as deter- 

 mined by digesting in a one-half per cent of hydrochloric acid foi 

 5 hours at 4o°c). Mr. Cavanaugh's figures are as follows : 



