Oct. 4. 191S Effect of A Ikali Salts in Soils on Crops 27 



decreased as the concentration of the solution increased, there being an 

 average of 9.7 plants to each glass alive where no salt was added to the 

 culture, but only 3.8 plants alive with 10,000 p. p. m. of salt. 



KCl 



s.oooppm 4.oooppm. s.oooppm. 



ChecK^NoSalt 



i.oooppm loooppm e.oooppm. s.oooppm. to.oooppm. 



. = One plant. — = 0.1 gm. dry matter; tops \ = 0.1 gm. dry matter; roots. 



Fig. 34. — Diagram showing the number of wheat seedlings alive and dry matter produced in tops and roots 

 in 21 days with solutions of potassium chlorid, calcium chlorid, and magnesium chlorid in different com- 

 binations and concentrations. 



There was a corresponding decrease in number of leaves per plant, 

 height of plants, length of roots, weight of tops, and weight of roots as 

 the concentration of salts increased. The weight of roots, however, was 

 not so much affected as some of the other results. In the cultures in 



"t toooppm."S^ "i/» Zfiooppm. 3,oooppm. 4.oooppm. 5.oooppn. 



Oieck^NoSalt. 



e.ooop.p.m. i.oooppm. B.oooppm. 9.ooop.p.mJ. ro.oooppm. 



, = One plant. — = 0.1 gm. dry matter; tops \ = 0.1 gm. dry matter; roots. 



Fig. 25. — Diagram showing the number of wheat seedlings alive and dry matter produced in tops and 

 roots in 21 days with solutions of sodium nitrate, potassium nitrate, and magnesium nitrate in different 

 combinations and concentrations. 



which no salts were added, the height of plants, the length of roots, and 

 the dry matter produced were not so great as in the cultures containing 

 salts in low concentrations. 



