30 



Journal of Agricultural Research 



Vol. V, No. I 



was no germination whatever when ammonium carbonate was present 

 even in as low a concentration as i,ooo p. p. m., but in the loams this 



iz; s M ;?; M 



Fig. 27. — Curve showing the number of wheat plants germinating in College loam, Greenville loam, and 

 sand containing various salts. Average for all concentrations. 



salt was not so toxic as some of the chlorids. The salts are arranged in 

 the order of their toxicity to germination in Greenville loam. 



1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 

 Concentxation of salts in p. p. m. 

 Fig. 2S.— Curve showing the effect of various combinations of salts in different concentrations on the num- 

 ber of wheat plants germinating. Average of 15 combinations. 



Figure 28 gives results where three salts were present in the soils in 

 various combinations. Potassium chlorid, calcium chlorid, and mag- 



