Influence of the Salts Common in Alkali Soils 

 upon the Growth of Rice Plant. III. 



On the Antagonistic Action of Sodium 

 Salts, Potassium Salts, Sodium and 

 Potassium Salts on Each Other. 



By 

 Koji Miyake. 



In the preceding paper, it was pointed out that the poi- 

 sonous effect of the salts more or less completely disappears 

 when we mix the two salts in a proper proportions, while in 

 the single salt solution they have an injurious action upon the 

 growth of rice seedlings. It was also reported that the an- 

 tagonistic action of salts is due to that of the cations and 

 anions formed by dissociation of the salts ; the antagonism 

 between anions is small in comparison with that between 

 cations ; the divalent cations generally antagonize monovalent 

 very markedly, but on the contrar}', monovalent cations do not 

 strongly antagonize divalent cations. 



In this paper of our series of studies on the influence of the 

 salts common in alkali soils upon the growth of rice plant, we 

 have specially undertaken to test the antagonism between 

 sodium salts, potassium salts, and sodium and potassium salts. 

 Chloride, sulphate and nitrate of soda and potash were selected 

 as the salts to be tested, and the following experiments were 

 made : 



I. Experiment with Na>S0 4 and K : SO,. 



8 beakers of about 5.5 em diameter and 7 cm deep, each 

 containing 30 cc of culture lluids, served for the experiment. 



