38 



TABLE XIV. 



WATER SOLUBLE CONSTITUENTS IN TIBURONES SOILS, 

 ON MOISTURE FREE BASIS, IN % 



SERIE III. 



12 3 4 5 



(HCO 3) 2 .284 .417 .465 .430 .566 



CI 2 .124 .126 .125 .199 .297 



So 4 .237 .204 .278 .201 .358 



Total Salts .891 1.018 1.186 1/158 1.710 



(HCO 3) 2+CI 2 .408 .543 .590 .628 .862 



SO 4 .237 .204 .278 .201 .358 



It appears from (he analyses lliat the conditions in this area of the 

 marsh are less complicated than in the second series reported on before, 

 inasmuch as the proportion of the sulfates to the sum of bicarbonates and 

 chlorides is more uniform than it was there. While in the second series 

 the quantity of sulfates, expressed in per cent of the sum of bicarbonates 

 and chlorides, ranged from 28% to 356 %, it varies here only between 

 31% and 59'/ . The amount of sulfates is throughout much smaller than 

 that of the sum of bicarbonates and chlorides, and the influence of the 

 sulfates is not only slight, but also about proportional. 



If we now compare the condition of the cane and the salt content 

 of the soils we find that the cane is the better, the smaller the quantity of 

 chlorides plus bicarbonates, and that the cane gradually becomes worse, 

 as that quantity increases. With .408% of bicarbonic acid plus chlorine 

 the cane is quite normal, and even with .543% it still makes a pretty 

 good showing. 



Combining these results with those of the second series of analyses, 

 we reach the final conclusion that cane in these marsh lands grows 

 well where the sum of bicarbonic acid ion and of chlorine does not exceed 

 0.4^ , always provided that the level of the ground water is low enough 

 to prevent the cane roots from coming in conlaet with it. Tf the sum of 



