Jan. 2. 1930 Lime and Sodium-Chlorid Tolerance of Wheat Seedlings 353 



With sodium sulphate the beneficial effects of the calcium salts were 

 just as pronounced as they had been with sodium chlorid, while no benefit 

 resulted from the use of either the barium or magnesium salt. 



SERIES 10 



Plate 46, A, shows the 3-day-old plants grown in the following solu- 

 tions: 



SOLUTION NO. CONCENTRATION OP SOLUTION. 



1 Distilled water. 



2 4,000 parts per million of sodium sulphate. 



3 4,000 parts per million of sodium sulphate + 30 parts per million of potas- 



sium chlorid. 



4 4,000 parts per million of sodium sulphate + 30 parts per million of sodium 



nitrate. 



5 4,000 parts per million of sodium sulphate + 30 parts per million of ferric 



oxid. 



6 4,000 parts per million of sodium sulphate + 30 parts per million of 



aluminum oxid. 



The oxid of iron and aluminum were here included for the reason 

 that they have shown a marked effect upon slightly acid cultures in pre- 

 vious work with wheat seedlings,* but neither these nor the two fertiliz- 

 ers showed any effect. 



SERIES II 



Plate 46, B, shows 1 1 -day-old plants which had been grown in the fol- 

 lowing solutions of sodium bicarbonate: 



SOLUTION NO. CONCENTRATION OP SOLUTION. 



1 2,500 parts per million of sodium bicarbonate. 



2 2,500 parts per million of sodium bicarbonate -|- 30 parts pei million of 



sodium nitrate. 



3 2,500 parts per million of sodium bicarbonate + 30 parts per million 



of potassium chlorid. 



4 2,500 parts per million of sodium bicarbonate -(- 30 parts per million of 



magnesium sulphate. 



5 2,500 parts per million of sodium bicarbonate + 30 parts per million of 



calcium oxid. 



The beneficial effects of the lime are shown here also, although not in 

 so great a degree as with sodium chlorid or sodium sulphate. The ex- 

 periment with sodium bicarbonate was repeated several times ; but while 

 the tops showed distinct effects of the calcium salts, no such marked dif- 

 ference was noticed in the root development. 



' Breazeale, J. F., and Le Clerc, J. A. the growth op wheat seedlings as affected by acid or al- 

 kaline CONDITIONS. U. S. Dept. Agr. Bur. Chem. Bui. 149, 18 p., 8 pi. 1912. 



