24 



Journal of Agricultural Research 



sugar beets, (6) alfalfa, and (7) Canada field peas. It may be that after 

 the crops get a good start their resistance would not be in just this 

 order; but in the percentage of seeds germinated this order seems to hold. 

 Barley was able to withstand about twice as much alkali as field peas. 



z.oooppm. 

 ChecK^NoSalt 



Aoooppn. 



^oooppn 



loooppm. coooppn. 



- = 0.1 gm. dry matter. 



toooppm.. 



w.oooppm. 



Fig. 19. — Diagram showing the number of oat plants up and dry matter produced in ai days on Green- 

 ville loam with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations and 

 concentrations. 



iOOOppm. 



Check.(i^NoSalt 



Aoooppm. 



s.oooppn. 



6.oooppn 7.oooppm toooppm. iooopppi tcoooppm. 



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



Fig. 20. — Diagram showing the number of sugar-beet plants up and dry matter produced in 21 days on 

 Greenville loam "with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations 

 and concentrations. 



SOLUTION CULTURES 



In order to compare the effect of salts in solution cultures with the 

 same salts in soils, a number of tests were made with seedlings growing in 

 distilled water to which various salts had been added. Glass tumblers 

 were filled with water containing the proper quantity of the desired 



