36 
Journal of Agricultural Research 
Vol. V, No. i 
chlorid, and magnesium chlorid in a concentration of 8,000 p. p. m. was 
over 20 days, which was nearly four times as long as the time required for 
seeds to come up where no salt was added. The period of germination 
was less with the sulphates and carbonates than with the other salts. 
The time of germination of different crops in the presence of sodium 
chlorid, sodium carbonate, and sodium sulphate in combination is shown 
in figure 39. Where no salts were added, the time varied from about 
4K days for barley to nearly 8 days for sugar beets. The same general 
relation between the germination of various crops continued with the 
different concentrations of salts. Alfalfa was least affected by salts of 
any of the crops in the length of its germination period. 
Fig. 36.—Curve showing the number of days for wheat plants to come up in College loam, Greenville loam- 
and sand with different concentrations. Average of 13 salts. 
Figure 40 shows the effects of individual salts on the germination 
period of different crops. This brings out again the fact already men¬ 
tioned, that the same relative toxicity of salts does not hold for all crops. 
HEIGHT OF PEANT 
Figures 41, 42, 43, 44, and 45 show the effect of various factors on the 
height of plants. This is probably one of the best means of comparison 
for young plants of this kind. 
Plants growing in sand were not so high in any case as those growing 
in other soils; in the Greenville loam they were slightly higher than in 
College loam. The height in loam was greater with 1,000 p. p. m. of 
salt than where no salt was added, but above this point the height 
decreased considerably as the concentration of salt increased. In sand 
