496 SOILS: PROPERTIES AND MANAGEMENT 



experiments by various investigators, and their avail- 

 ability for the nutriment of higher plants : - 



READILY ASSIMILATED 



Ammonium salts 

 Acetamide CH 3 . CO . NH 2 



Urea CO<*J 



Barbituric acid (with calcium carbonate) 



/NH . CO\ 



^ . co/ 



Alloxan CO^SS'r^XX) 



MNI 11 . lAK 



Hurnates 



ASSIMILATED 



Formamide H . CO . NH 2 



Glycine NH 2 . CH 2 . COOH 



Aminopropionic acid CH 3 . CH(NH 2 ) . COOH 



/NH 2 

 Guanidine hydrochloride [C = NH HC1 



\NH 2 _ 



/"VTT C* 

 Cyanuric acid 



CO . NH 2 

 Oxamide 



CO . NH 2 



CH(NH 2 )COOH 



Sodium aspartate 



Clia . COOH 



Peptone 



