32 



Journal of Agricultural Research 



Figure 31 shows that the production of dry matter was stimulated by 

 the presence of 1,000 p. p. m. of salt in the Greenville and College loam, 

 but was about the same in sand for 1,000 p. p. m. as where no salt was 



Sugar beets Wheat Com Field peas Oats Barley Alfalfa 



Fig. 30. — Curve showing the effect of sodium chlorid, sodium carbonate, and sodium sulphate on the 

 number of plants up from seeds of various kinds. Average for concentrations from 1,000 to 10,000 

 p. p. m. 



o 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. ra. 

 Fig. 31. — Curve showing the dry weight of wheat plants germinating in College loam, Greenville loam, 

 and sand with different concentrations. Average of 13 salts. 



added. The quantity of dry matter rapidly decreased with the concen- 

 tration of salt above this point. In sand there was no plant growth at 

 all above 8,000 p. p. m. of salt. 



