20 
Journal of Agricultural Research 
Vol. V, No. i 
In sand the limit of growth in the presence of sulphates is shown by 
figure io to be less than 10,000 p. p. m., while in the loam growth 
was scarcely retarded at this concentration. Plants seem able to resist 
decidedly more magnesium sulphate than either potassium sulphate or 
ChecK^NoSalt 
. = One plant. — = 0.1 gm. dry matter . 
Fig. ii.—D iagram showing the number of wheat plants up and dry matter produced in 14 days on coarse 
sand with ammonium carbonate, sodium carbonate, and potassium carbonate in different combinations 
and concentrations. 
ioooppm v ** C0 * tpooppm. 3 . 000 ppm. 4>oooppm. 3,oooppm. 
Check^NoSalt 
*,000 ppm. xoooppm zoaoppm. wooppm. laoooppm. 
. = One plant. — — 0.1 gm. dry matter. 
Fig. 12 .—Diagram showing the number of wheat plants up and dry matter produced in 16 days on College 
loam with sodium sulphate, sodium carbonate, and sodium chlorid in different combinations and 
concentrations. 
sodium sulphate. This is in accord with the earlier results found in 1912 
and 1913. 
Figure 11 shows that there was no germination whatever in sand where 
even as little as 1,000 p. p. m. of ammonium sulphate were found. With 
