i68 
C. B. LIPMAN AND W. F. GERICKE 
show, as clearly as any obtained with the adobe soil, how markedly 
CUSO4 antagonizes NaCl. Even 50 parts per million of CUSO4 added 
to .4 percent NaCl is sufficient to obliterate entirely the toxic effects 
of the last-named salt and perhaps even to go beyond in the direction 
of stimulation. Large quantities of CUSO4 as high as 400 and 500 
parts per million are also very effective in antagonizing .4 percent 
NaCl. There would seem to be much promise in the data obtained 
for application to alkali conditions in the field, Hke those obtaining in 
the Imperial Valley. 
Series X 
ZnS04 versus NaCl — Oakley Soil 
NaCl .4 percent constant — ZnS04 varying 
While the absolute yields in this series were small, the data in 
Table XIII show clearly that ZnS04 has a definite power of antago- 
nizing NaCl when the latter is used at the toxic concentration of .4 
percent. At high concentrations of ZnS04 plus .4 percent NaCl, no 
growth was obtained. 
Table XIII 
Antagonism Between ZnSO^ and NaCl For Barley — Oakley Soil, First Crop 
•ji NaCl 
ZnS04 in 
Wt. of 
Wt. Dry Mat- 
Wt. of 
Wt. of 
No. 
Parts per 
Million 
Wt. of Straw 
ter Above 
Total Dry 
Added 
Grain 
Surface 
Roots 
Matter 
.4% 
g- 
g. 
g- 
g- 
I 
100 
1-73 
•17 
1.90 
.20 
2.10 
2 
.4% 
100 
3.85 
3-85 
.70 
4-55 
3 
.4% 
200 
2,40 
•30 
2.70 
.52 
3.22 
4 
.4% 
200 
2.42 
.18 
2.60 
.70 
3-30 
5 
.4% 
300 
370 
370 
45 
■ 4-15 
6 
.4% 
300 
1-95 
•05 
2.00 
.40 
2.40 
7 
.4% 
400 
2.15 
2.15 
•35 
2.50 
8 
.4% 
400 
1.90 
.10 
2.00 
.34 
2.34 
9 
.4% 
500 
3.35 
3.35 
.48 
3.83 
10 
.4% 
500 
1.67 
.08 
175 
.22 
1.97 
II 
.4% 
.4% 
1,000 
Trace 
Trace 
12 
1,000 
Trace 
Trace 
13 
.4% 
2,000 
14 
.4% 
2,000 
15 
.4% 
3,000 
16 
.4% 
3,000 
17 
.4% 
.72 
.72- 
.06 
.78 
18 
.4% 
1.05 
1.05 
.10 
1. 15 
19 
.4% 
•75 
75 
.05 
.80 
20 
4.70 
4.70 
•25 
4-95 
21 
3-30 
3-30 
.32 
3.62 
