Oct. 4, 1915 
Effect of Alkali Salts in Soils on Crops 
39 
Fig. 40.—Curve showing the effect of sodium chlorid, sodium carbonate, and sodium sulphate on the num¬ 
ber of days to come up from seeds of various kinds. Average for concentrations from 1,000 to 10,000 
p. p. m. 
Vs 
\ 
N 
\ 
\ 
\ 
\ 
> 
\ 
- 
— 
\ 
\ 
■■ — mctmue 10 am 
~ - COUECE LOAM 
— — — COARSE 3 AND. 
— — — 
—— — 
/. i 
/ ■ 
/ 
O 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10, 
Concentration of salts in p. p. m. 
Fig. 41.— Curve showing the height of wheat plants germinating in College loam, Greenville loam, and 
sand with different concentrations. Average of 13 salts. 
