496 SOILS: PBOPEBTIES AND MANAGEMENT 



experiments by various investigators, and their avail- 

 ability for the nutriment of higher plants : — 



Readily Assimilated 



Ammonium salts 

 Acetamide CH3 . CO . NH2 



Urea CO<^g 



Barbituric acid (with calcium carbonate) 



Alloxan CO<^^tt ' p^/CO 



Humates 



Assimilated 



Formamide H . CO . NH2 



Glycine NH2 . CH2 . COOH 



Aminopropionic acid CH3 . CH(NH2) . COOH 



Guanidine hydrochloride NH . C\'c^-rT^ 



/NH C0\ 

 Cyanuric acid C0<' -^ttt * p^/NH 



CO . NH2 

 Oxamide 



CO . NH2 



CH(NH2)C00H 

 QOCLium asparxate 



CH2 . COOH 

 Peptone 



