158 
C. B. LIPMAN AND W. F. GERICKE 
the untreated control by approximately 60 percent. But concen- 
trations of CuCl2 with .3 percent NaCl increase the yields again to a 
point only about 30 percent below the yield of the control plants. 
Again, as in the first series, all the concentrations of CuC^ used exhibit 
antagonizing powers to NaCl, and the smallest concentrations are as 
effective as the larger ones, if not more so. 
Table IV 
Antagonism Between CuCh and NaCl For Barley — Adobe Soil, First Crop 
No. 
fo NaCl 
Added 
CuCl2 Added 
in Parts per 
Million 
Wt. of Straw 
Wt. of 
Grain 
Wt. Dry Mat- 
ter Above 
Surface 
Wt. of 
Roots 
Wt. of Total 
Dry Matter 
I 
2 
3 
4 
5 
6 
7 
8 
9 
10 
II 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
.3% 
50 
50 
100 
100 
150 
150 
200 
200 
250 
250 
300 
300 
350 
400 
400 
450 
450 
500 
500 
g. 
6.28 
4.87 
7.68 
8.00 
6.22 
6.00 
6.63 
7.40 
6.18 
6.08 
5.98 
6,07 
6.38 
5-28 
4.20 
5.60 
4.88 
4.76 
4.26 
5.23 
4.08 
10.70 
14.00 
12.05 
&• 
1. 12 
2.13 
4-32 
3-50 
3-78 
1.80 
3- 37 
340 
2.82 
2.52 
3.82 
1-93 
1.82 
2.22 
4- 30 
1.80 
2.62 
2.64 
3- 04 
•37 
•92 
4- 30 
1-75 
g. 
7.40 
7.00 
12.00 
11.50 
10.00 
7.80 
10.00 
10.80 
9.00 
8.60 
9.80 
8.00 
8.20 
7-50 
8.50 
7.40 
7.50 
7.40 
7-30 
5.60 
5.C0 
10.70 
18.30 
14.80 
p- 
&• 
1.75 
1. 00 
1.30 
1. 00 
1.20 
.70 
1.50 
1.70 
1,20 
2.00 
1.40 
.40 
.60 
1. 00 
1.20 
.70 
.40 
•70 
.65 
.81 
.40 
2.50 
2.00 
1.40 
Q- 
9-15 
8.00 
13-30 
12.50 
11.20 
8.50 
11.50 
12.50 
10.20 
10.60 
11.20 
8.40 
8.80 
8.50 
9.70 
8.10 
7.90 
8.10 
7-95 
6.41 
540 
13.20 
20.30 
16.20 
Very much more marked, however, than the antagonism which 
characterizes the three series as regards straw yields, is that concerned 
with the grain yields. In the first crop, the grain yields are from three 
to six times as great in the copper-treated cultures as in those receiving 
only NaCl, and equal, and in certain instances surpass, in quantity, the 
yields of the untreated control soils. In the second crop, the grain 
yields are only slightly increased through the instrumentality of the 
antagonism in question. In the third crop, the yields of grain in the 
antagonism cultures are doubled and even trebled when compared 
