2o6 



Journal of Agricultural Research 



Vol. IV, No. 3 



among the figures given ; nevertheless, it can not be denied that through- 

 out the series all the salt mixtures yield far better results than the 0.2 

 per cent of sodium chlorid alone. Indeed, only in one salt mixture (one 

 of the pots of experiment 10) does the yield fall as low as in the 

 duplicate pots of experiment 2. In one case, No. 8, the total yield 

 of dry matter, while not equal to that of the controls, is very near the 

 latter, despite the fact that the soil contains 0.55 per cent of total salts. 

 Yet, in the case of No. 2, with considerably less than half the amount of 

 salt present, the yield is depressed approximately 40 per cent below that 

 of the control pots. In the face of such data, erratic as they seem in 

 some respects, there can be no denial of the existence of antagonism 

 between anions. This record is the first, except the preliminary note (4) 

 referred to above, establishing the existence of antagonism between 

 anions for the higher plants when the latter are grown in normal soils. 



ANTAGONISM BETWEEN SODIUM CHLORID AND SODIUM CARBONATE 



In this series there was again employed the constant toxic quantity of 

 0.2 per cent of sodium chlorid throughout. The varying antagonistic 

 agent of the last series, however (sodium sulphate), was here supplanted 

 by sodium carbonate. Other explanatory data are recorded in Table III, 



Table III. 



-Results of experiments on antagonism between sodium, chlorid and sodium 

 carbonate 



a No growth. 



Studying the data of Table III, evidence of only slight antagonism in 

 the first crop is again seen. It should be noted, however, that, slight as 

 it is, it is much more definite than in the case of the foregoing series. 



