Oct. 4, 19IS 



Effect of Alkali Salts in Soils on Crops 



25 



solution. The glasses were then covered with paraffined paper which 

 was bent over the edges and held in place by rubber bands. New Zealand 

 wheat was gemiinated between moist filter papers until its roots were 

 about half an inch long, when 10 seedlings to each glass were placed in 



t^'t-io^ loooppm^'*^'^' tfiooppm. 3.oooppm. Aoooppm. 



SfiooppnL 



6.oooppni i.oooppm. estooppm. 



. = One plant. — = 0.1 gm. dry matter. 



noooppm. 



lo.oooppm. 



Fig. 21. — Diagram showing the number of alfalfa plants up and dry matter produced in 21 days on College 

 loam with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations and con- 

 centrations. 



zfiooppm. ioooppm. 4.oooppm. 



Check^NoSalt 



Sfiooppn. 



lOOOppm. 6.000 pptTL 



0. 1 gm. dry matter. 



ioooppm.. 



noooppm. 



Fig. 23. — Diagram showing the number of Canada field-pea plants up and dry matter produced in 21 

 days on Greenville loam with sodium chlorid, sodium sulphate, and sodium carbonate in different com- 

 binations and concentrations. 



holes in the paraffined paper, so that their roots grew down into the 

 solutions. 



The loss of water due to transpiration was made up every day or two. 



The glasses were arranged in the triangular diagram as in the experi- 

 ments with soils, which have already been discussed. In each test the 



