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Journal of Agricultural Research 
Vol. V, No. i 
was no germination whatever when ammonium carbonate was present 
even in as low a concentration as 1,000 p. p. m., but in the loams this 
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 
Concentration of salts in p. p. m. 
Fig. 28.—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- 
