158 



M. M. McCooL 



TABLE 26. Wheat (Growth during Thirty Days). Quantities Given are Cubic 

 Centimeters of .12 M Solutions 



Culture solution 



Aggregate 

 length of 



roots 



per plant 



(millimeters) 



NaCl .... 

 100 NaCl 



10 KCl 

 100 NaCl 



35 KCl 



35 NaCl 

 100 KCl /••• 



KCl 



Distilled water 



55 

 115 



130 



80 



65 



725 



Hansteen (1909) found only slight antagonism between sodium and 

 potassium in distilled water. Wheat was used as the indicator. 



The harmful influences of potassium and sodium are reduced when these 

 bases are combined even in widely different ratios. From the experiments 

 with pea seedlings it is seen that a solution of N/500 NaCl very slightly 

 reduces the toxicity of N/50 KCl. The minimum amount of potassium 

 that may antidote a given amount of sodium was not determined, but 

 relatively dilute solutions reduce the poisonous action of comparatively 

 concentrated solutions of sodium. The solutions used and the data 

 obtained are given in the following table: 



TABLE 27. 



Experiment with Canada Field Pea. Duration, Twenty-four Days. 

 Data for Ten Plants 



Composition of solution 



Green weight 

 of roots 

 (grams) 



Average length 



of tops 



(centimeters) 



Average length 



of roots 

 (centimeters) 



N/50 NaCl+N/50 KCl. 

 N/50 NaCl+N/100 KCl 

 N/50 NaCl+N/oOO KCl 

 N/100 NaCl+N/.50 KCl 

 N/500 NaCl + N/50 KCl 



N/50 KCl 



N/100 KCl 



N/500 KCl 



N/50 NaCl 



N/100 NaCl 



N/500 NaCl 



Distilled water 



2.56 

 3.30 

 4.40 

 2.25 

 1.60 



1.70 

 1.80 

 

 Slight 

 2.60 

 1.74 



6.00 

 8.00 



11.00 

 6.50 

 5.00 

 0.75 

 5.00 

 5.50 



Slight 

 4.00 

 7.00 

 6.00 



4.00 

 7.00 

 11.00 

 4.00 

 Very slight 

 



4.00 

 4.50 

 



2.00 

 7.00 

 6.50 



