228 



THE BOTANICAL MAGAZINE. 



XXVII. X' 



VI. Experiment with K,S0 4 and KNO ; . 



The antagonism which is similar to that of the preceding 

 experiment was once more repeated with potassium salts and 

 a result nearly similar to that of above experiment was 

 obtained, as will he seen in the following table: 



Solutions used 



Length 

 of leaf 



Length 

 of root 



Number 

 of roots 



1/10 N. 7wb'^ 4 30cc. 



mill. 



40 



mm. 



35 



6* 



1/10 N. K,S0 4 25 cc. + 1/10 N. KXO, 5 cc. 



58 



45 



7x 



1/10 N. K 2 S0 4 20 cc. + 1/10 N. KN0 3 10 cc. 



53 



38 



6x 



1/L0 N. K,S0 4 15 cc. + 1/10 N. KNO s 15 cc. 



45 



38 



6x 



1 /10 X. K,S0 4 10 cc. + 1/10 N. KNO z 20 cc. 



50 



42 



6x 



1/10 N. K 2 S 4 5 cc. + 1/10 N. KN0 2 25 cc. 



40 



35 



6x 



1/10 N. KNO z 30 cc. 



40 



35 



4x 



Distilled water 30 cc. 



68 



43 



7 



X Only one root was well developed. 



VII. Experiment with K"aN"0 3 and NaCl. 



The antagonistic action of N0 3 ' and CI' ions on each other 

 was examined w'ith the solution of sodium nitrate and chloride 

 in the same manner as in the case of the Experiment I. The 

 transplanting of young rice seedlings, about 25 mm high, took 

 place on February 20th (1913) and the plants were measured 

 on March 5th with the following result. 



