June IS, 191S Antagonism between Anions as Affecting Barley 



205 



Table II- — Results of experiments on antagonism between sodium chlorid and sodium, 



sulphate 



It is plain that in the first crop there can have been only the slightest 

 antagonism, if any. It is true, however, that the medium of growth 

 does not seem to have become seriously impaired through the addition 

 of sodium sulphate to the constant quantity of sodium chlorid up to and 

 including 0.2 per cent of sodium sulphate. After that, a very definite 

 depression in growth and yield is noticeable as more sodium sulphate 

 is added, indicating increased toxicity at combinations of 0.2 per cent 

 of sodium chlorid and 0.25 per cent of sodium sulphate, and above. 



Quite different conditions confront us in those parts of Table II devoted 

 to the results of the second crop. We note here, as in the foregoing 

 toxicity series (Table I), not only a marked depression in yield in experi- 

 ment 2 resulting from the presence of 0.2 per cent of sodium chlorid 

 but also a marked improvement in the yield when sodium sulphate is 

 added to the common salt. Thus, while we obtain an average yield of 

 7.25 gm. of dry matter (tops and roots) when 0.2 per cent of sodium 

 chlorid is present as against 12.77 gni^ i^ the control pots, the yield is 

 increased to 9.45 gm. when o.i per cent of sodium sulphate is present with 

 0.2 per cent of sodium chlorid, and is still further augmented to 10.52 

 gm. by the presence of 0.2 per cent of sodium sulphate with sodium 

 chlorid. To be sure, as was remarked above, much irregularity exists 



