148 



M. M. McCooL 



TABLE 15. 



Experiment with Canada Field Pea. Duratiox, Twextt-five Days. 

 Data for Tex Plants 



Composition of solution 



Green 

 weight 

 of tops 

 (grams) 



Green 

 weight 

 of roots 

 (grams) 



Total 



Average 

 length 



Average 

 length 



(nutrient solution as 

 the solvent) 



weight 

 (grams) 



of tops 

 (centi- 

 meters) 



of roots 

 (centi- 

 meters) 



X/10 CaCl,+X/25 XH4CI 



1.90 



2.60 



4.50 



6.0 



6.0 



N/25 CaCl,+X/25 XH4CI 



5.50 



4.52 



10.02 



11.0 



12.0 



N/50 CaCU+N/25 XH4CI 



4.29 



3.90 



8.19 



10.0 



12.0 



N/100 CaCl2+X/25 XH4CI. . . . 



4.91 



4.95 



9.86 



9.0 



11.0 



N/500 CaCL+X/25 XH4CI. . . . 



3.10 



4.15 



7.25 



7.0 



12.0 



N/25 CaCl,+X/500 XH4CI. . . . 



11.95 



7.80 



19.75 



18.0 



13.0 



N/25 CaClo+X/100 XH4CI. . . . 



11.08 



5.80 



16.88 



17.0 



13.0 



N/10 CaCl2+X/50 XH4CI 



6.81 



4.31 



11.12 



11.0 



8.0 



X '50 CaCU+X/oO XH4CI 



11.11 



6.20 



17.31 



15.0 



14.0 



X/100 CaCl3+X/50 XH4CI. . . . 



10.35 



5.70 



16.05 



14.0 



12.0 



N/500 CaCU+X/oO XH4CI. . . . 



9.45 



4.60 



14.05 



14.0 



12.0 



N/1,000 CaCl2+X/50 XH4CI. . 



8.45 



4.38 



12.83 



12.0 



12.0 



N/25 XH4CI 



3.50 

 9.75 

 8.80 

 9.60 

 10.40 



3.80 

 4.85 

 4.40 

 6.56 

 5.20 



7.30 

 14.60 

 13.20 

 16.16 

 15.60 



7.0 

 11.0 

 12.0 

 17.0 

 13.0 



12.0 



N/5OXH4CI 



11.0 



X7IOO XH.Cl 



12.5 



X,500XH4C1 



11.0 



Nutrient solution . . 



10.0 







Fig. 5. — Antidotal relations between calcium and ammonium; nutrient solution as the solvent 



N/IO CaCla 



1. X/10CaCl2+X/25XH4Cl 



2. X/25 CaCl2+N/25 XH4CI 



3. N/100 CaCl2+N/25XH,Cl 



4. N/500 CaCl2+N/25 NH4CI 



9. Nutrient solution 



5. 



6. N/2o CaCh 



7. N/500 CaCh 



8. N/25 NH4CI 



