COMMON SALT WITH SALTS OF AMMONIA. 



337 



Bogeiihausen, 1857. 



JBogenhausen, 1858 (p. 303). 



111 both these series of experiments, the crops of 

 corn and straw were remarkably increased by the addi- 

 tion of common salt; and it is scarcely necessary to 

 repeat, that such an augmentation could not possibly 

 have taken place unless the soil had contained a certain 

 quantity of phosphoric acid, silicic acid, potash, &c., 

 capable of being brought into operation, but which with- 

 out common salt was not assimilable. 



Similar experiments were undertaken by the same 

 society in Weihenstephan with nitrates ; and the crops 

 produced by these salts alone, and with the addition of 

 common salt, per hectare, were as follows : — 



