40 



Journal of Agricultural Research 



Vol. V. No. I 



12; o 



sand containing various salts. Average for all concentrations. 



c 



!s ^ 



vt 



1 ^ 



5 4 

 o 



I ^ 



W 2 



O I.OOO 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 



Concentration of salts in p. p. m. 

 — Curve showing the effect of various combinations of salts in different concentrations on the height 

 of plants. Average of 15 combinations of each group of 3 salts. 



