Relations of Manganese and Other Cations 



197 



TABLE 15. Experiment Continued for Twenty-five Days. Data for Eight Plants 



Composition of solution 

 (N/1000 CaCli as the solvent) 



Green 



Green 



Total 



Average 



weight 



weight 



green 



length 

 of tops 

 (centi- 

 meters) 



of tops 



of roots 



weight 



(grams) 



(grams) 



(grams) 



2.10 



1.20 



3.30 



6.0 



2.75 



1.84 



4.59 



8.0 



3.62 



2.04 



5.66 



13.0 



4.80 



2.40 



7.20 



13.5 



4.75 



2.50 



7.25 



12.0 



4.00 



2.30 



6.30 



11.0 



4.20 



2.00 



6.20 



16.0 



4.90 



2.50 



7.40 



14.0 



1.75 



1.65 



3.40 



7.0 



2.54 



1.75 



4.29 



10.0 



3.57 



1.70 



5.27 



12.0 



Average 

 length 

 of roots 

 (centi- 

 meters) 



N/50 MgCl2 



N/100 MgCh 



N/200 MgCl2 



N/50 MgCl2+N/500MnCl2. . . 

 N/100 MgCl2+N/500 MnCl2. . 

 N/200 MgCl2+N/500 MnCh. . 

 N/100 MgCl2+N/l,000 MnCl2 

 N/200 MgCl2+N/100 MnCh. 



N/500 MnCl2 



N/1,000 MnCl2 



N/1,000 CaCU 



7.0 

 9.5 

 12.0 

 12.5 

 13.0 

 13.0 

 14.0 

 14.0 

 12.0 

 13.0 

 10.0 



grown in these cultures become chlorotic and the top growth is reduced. 

 The addition of N/20 MgCl2 prevents this injury. Moreover, the 

 presence of N/50 MgCl2 prevents chlorosis which appears in plants 

 grown in solutions of N/500 MnCl2. 



TABLE 16. Experiment Continued for Twenty-five Days. Data for Eight Plants 



Composition of 



solution 



(full nutrient solution 



as the solvent) 



Green 

 weight 

 of tops 

 (grams) 



Green 

 weight 

 of roots 

 (grams) 



Average 

 length 

 of tops 

 (centi- 

 meters) 



Average 

 length 

 of roots 

 (centi- 

 meters) 



Remarks 



N/200 MnCl2 



N/500 MnCla 



N/50 MgCl2 



N/20 MgCl2+N/200 

 MnCl2 



N/50 MgCl2+N/200 

 MnCl2 



N/50 MgCl2+N/500 

 MnCl2 



Nutrient solution. . . . 



3.10 

 6.20 

 7.15 



6.05 



4.10 



7.27 

 7.27 



2.60 

 3.00 

 3.50 



2.80 



2.75 



3.40 

 3.60 



8.0 

 15.0 

 13.0 



17.5 



16.0 



17.0 

 14.0 



10.0 

 12.0 

 14.0 



18.0 



16.0 



13.0 

 13.0 



Lateral roots long, leaves 



j'ellow 

 Lateral roots long, leaves 



yellowish 

 Lateral roots short, leaves 



dark green 

 Lateral roots short, color of 



leaves good 

 Lateral roots long, color of 



leaves pale 

 Lateral roots medium, color 



of leaves good 

 Lateral roots medium, color 



of leaves good 



