i64 
C. B. LIPMAN AND W. F. GERICKE 
Series VI 
ZnS04 versus NaCl — ^Adobe Soil 
NaCl 4 percent constant — ZnS04 varying 
This series brings into play four ions instead of three, as in the series 
in which the antagonizing salts possess the same anion. The results 
are given in Table IX, together with the usual explanatory data. 
Once again, we see the marked evidences of the toxic properties of 
.4 percent NaCl to barley in the adobe soil and the equally marked 
Table IX 
Antagonism Between ZnSO^ and NaCl For Barley — Adobe Soil, One Crop 
No. 
'■i NaCl 
ZnS04 in 
Parts per 
Million 
Wt. of Straw 
Wt. of 
Wt. Dry Mat- 
ter Above 
Wt. of 
Wt. of Total 
Added 
Grain 
Surface 
Roots 
Dry Matter 
I 
.4% 
50 
5.88 
g- 
372 
g- 
9.60 
g- 
.65 
10.25 
2 
.4% 
7.90 
3-80 
11.70 
.65 
12.35 
3 
.4% 
100 
8.90 
370 
12.60 
1. 10 
13.70 
4 
.4% 
100 
9.96 
4.24 
14.20 
1. 14 
15-34 
5 
.4% 
300 
8.80 
5.00 
13.80 
.40 
14,20 
6 
•4% 
.4% 
300 
9.04 
4-56 
13.60 
75 
.75 
7 
500 
5-24 
4.16 
9.40 
.84 
10.24 
8 
.4% 
500 
6.10 
3-50 
9.60 
.70 
10.30 
9 
.4% 
700 
7.30 
4-50 
11.80 
1. 00 
12.80 
10 
.4% 
.4% 
7C0 
7-30 
2.70 
10.00 
.55 
10-55 
II 
1,000 
8.15 
3-85 
12.00 
.80 
12.80 
12 
.4% 
1,000 
6.30 
370 
10.00 
1.20 
11.20 
13 
.4% 
5.00 
1.90 
6.90 
.40 
7-30 
14 
.4% 
4.70 
2.30 
7.00 
•55 
7-55 
15 
.4% 
5-75 
75 
6.50 
•45 
6.95 
16 
12.20 
5-30 
17-50 
2.50 
20.00 
17 
8.44 
4-56 
13.00 
3-40 
16.40 
antagonizing properties thereto of another salt. As triplicate pots 
show clearly, less than half the yield of barley is obtained in the NaCl- 
treated soils of that produced in the control pots. The addition to 
the NaCl, however, of 50 parts per million of ZnS04 very largely over- 
comes the toxic effect in question, and the addition of 100, or 300 parts 
per million of ZnS04 almost entirely obliterates it. The addition of 
larger quantities of ZnS04 seems to be less effective than the last two 
named, but about as effective as 50 parts per million up to and includ- 
ing the largest quantity used, viz., 1,000 ^)arts per million. Again, the 
effects of antagonism are marked with respect to grain and straw pro- 
duction, as well as with respect to root yields, though perhaps least 
striking in the latter case. 
