3 68 



Mineral Nutrition of Plants 

 TABLE III 



Effects of Mineral Deficiency on Free Alpha-Amino Nitrogen and Protein 

 Nitrogen oi Plants: Iron, Copper, Molybdenum, Boron 



Plant 



Symp- 

 toms 



Deficiency/Control Ratios 



Leaves 



Amino 

 acid-N* 



Protein 



N 



Stems 



Amino 



acid-N* 



Protein 



N 



Refer- 

 ence 



Mean 



1.16(2) 1.24(7) 



(') 



(12) 



(™) 



{24) 

 (24) 

 (24) 

 (24) 

 (24) 

 (24) 

 (24) 

 (24) 



Mean 



0.61 



0.78 



0.96(7) 0.83(7) 0.61(7) 0.78(7) 



(28) 

 (28) 



Mean 



1.08 8 



0.78 



0.99(2) 0.72(7) 1.08 (/) 0.78(7) 



(J) 



(3) 

 (38) 

 (39) 

 (5o) 



''Values representing soluble nitrogen are indicated by "s," and soluble organic nitrogen by 



a clear cut interpretation. Scripture and McHargue reported increased 

 free amino acids in alfalfa tops (38) and spinach (jo) and a drop in 

 protein in the latter. Briggs (3) found amino acid and protein nitrogen 

 decreased to about the same extent in the leaves of the nasturtium plant, 

 whereas the former increased and the latter decreased in the stems. A 



