Apr. 28,1933 
T oxicity and Antagonism of Alkali Salts in Soil 
333 
It is unfortunate that the initial quantity of the latter salt was so large, 
because no information is afforded concerning the nontoxic concentra¬ 
tions of sodium arsenite, except inferentially from the complex mixtures. 
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Fig. II.— Diagram showing the effect on the growth of wheat plants of adding sodium salts to Greenville 
loam impregnated with sodium carbonate. The maximum concentrations of the individual salts are 
given in the text. 
The usual regular arrangement of the mixture curves and also the addi¬ 
tive toxicity of the carbonate is evident in the diagram. No corrective 
action on black alkali, however, is shown in this experiment. 
The physiological action of the borax and arsenite on the wheat 
plants was so striking and so characteristic that it should be mentioned 
here. Borax caused the leaves of the plants to remain closed up around 
