COPPER AND ZINC AS ANTAGONISTIC TO " ALKALI " SALTS l6l 
Table VI 
Antagonism Between CuCh and NaCl For Barley — Adobe Soil, Third Crop 
No, 
fc NaCl 
Added 
CuCb in 
Parts per 
Million 
Wt. of Straw 
Wt. of 
Grain 
Wt. Dry Mat- 
ter Above 
Surface 
Wt. of 
Roots 
Wt. of Total 
Dry Matter 
•3% 
& 
& 
Of. 
Of. 
Of. 
I 
50 
6.30 
2.70 
9.00 
1. 16 
10.16 
2 
.3% 
=^0 
1.70 
6.20 
1.40 
i •■4-"-' 
7.60 
-2 
o 
•3% 
100 
s.io 
2.70 
7.80 
.74 
8.S4 
A 
•3% 
100 
5.75 
i.6s 
7.40 
.40 
7.80 
5 
•3% 
150 
3.50 
2.10 
5.60 
.25 
5.85 
6 
•3% 
150 
7.20 
2.40 
Q.60 
.SO 
10.10 
7 
•3% 
200 
6.14 
1.46 
7.60 
.40 
8.00 
8 
.3% 
200 
5-32 
2.08 
7.40 
.62 
8.02 
9 
•3% 
250 
3-35 
1.25 
4. DO 
5.18 
10 
•3% 
250 
4.70 
1.30 
6.00 
.36 
6.36 
II 
•3% 
300 
4.90 
5-40 
.60 
6.00 
12 
.3% 
300 
5-50 
2.30 
7.80 
Lost 
7.80 
13 
•3% 
350 
4-32 
1.28 
5.60 
.20 
5.80 
14 
•3% 
350 
5.00 
1.20 
6.20 
Lost 
6.20 
15 
•3% 
400 
4.00 
2.00 
6.00 
Lost 
6.00 
i6 
•3% 
400 
4.20 
1.80 
6.00 
.20 
6.20 
17 
.3% 
4.40 
2.00 
6.40 
•35 
6.75 
i8 
•3% 
450 
4-50 
2.50 
7.00 
•31 
7-31 
19 
.3% 
500 
3.60 
1.40 
5.00 
•38 
5.38 
20 
.3% 
500 
3.85 
2.35 
6.20 
.28 
6.48 
21 
•3% 
4.10 
.60 
4.70 
.65 
5-35 
22 
.3% 
3-04 
1. 16 
4.20 
.22 
4.42 
23 
7-50 
2.50 
10.00 
1.56 
11.56 
24 
12.70 
1.30 
14.00 
1.87 
15.87 
second crop in the other series an uncertain factor. Root yields were 
not obtained at all, owing to the bad physical condition of the adobe 
soil, induced by the Na2C03 applications. Unfortunately, this series 
was not continued through the third crop as were the others and the 
conclusions are, consequently, of less value than the foregoing. 
Series IV 
ZnS04 versus Na2S04 — Adobe Soil 
Na2S04 .6 percent constant — ZnS04 varying 
Owing to the difficulty encountered with the creeping of Na2S04 
up and out of the pots employed in these experiments, it was decided 
to try one series with zinc and sodium sulphates in large wide-mouth 
bottles. The results obtained with this series, which obviated the 
loss of Na2S04 from the soil, together with the general arrangement 
of the cultures are given in Table VII. Control cultures in bottles 
