PRACTICE XXIX 



EFFECT OF VARIED QUANTITIES OF SALTS IN SOLUTION ON 

 RAPIDITY AND ifelGHT OF RISE OF CAPILLARY WATER 



A class exercise to be arranged by the instructor. 



Use soils with a low organic content, as the rise of salt solu- 

 tions is quite irregular in soils containing considerable quantities 

 of organic matter. 



In tube No. 1 of each soil use distilled water. 



In tube No. 2, normal sodium chloride.^ 



In tube No. 3, three times normal sodium chloride. 



In tube No. 4, five times normal sodium chloride. 



In tube No. 5, a normal solution of the following: sodium 

 chloride, sodium carbonate, sodium nitrate, sodium sulfate, potas- 

 sium nitrate, and potassium chloride. 



In tube No. 6, three times normal of same mixture. 



This might be multiplied indefinitely, but these should give 

 a fair idea of the movement of salts in soils under laboratory 

 conditions. 



The tubes are filled with the same care as to uniform com- 

 paction, set up, and readings taken as in the three preceding 

 practices. 



References. 



** Physical Properties of Soil," Warington, pp. 211-231. 

 "Principles and Practice of Agricultural Analysis," Wiley, Vol. I, 



p. 170. 

 Bulletin No. 10, United States Department of Agriculture, Division 



of Soils, p. 20. 



1 See footnote under Practice XXXV. 



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