Oct., 1922] TURNER EFFECTS OF CERTAIN MINERAL SALTS 
Table 5 — Continued. 
Series 4, 
56 days 
•7350 
.1257 
5.84 
1-3527 
.1334 
10.14 
1.3164 
.161 1 
8. II 
I. 0361 
•1571 
6.59 
1.3000 
.1280 
10.15 
1.3200 
•1350 
9-77 
.5730 
•0943 
6.07 
1. 1826 
.1418 
8.34 
1.2264 
.1172 
10.46 
•9527 
.1772 
5.38 
I-I953 
.1600 
7-47 
1.2432 
.1238 
10.04 
Total . . 
3.2968 
.5543 
5.0306 
•5632 
5.1160 
•5371 
Mean . . 
5.97=t.i69 
1 
9.03 ±.454 
9.59±-347 
Difference High Nitrate — Low Nitrate = 3.62 i .386. 
Table 5a. Experiment II; Increase in Ratio of Tops to Roots in Young Barley Plants at 
Different Stages of Maturity 
{Averages of 4 Cultures, 4 Plants to a Culture) 
14 Days 
28 Days 
40 Days 1 56 Days 
Low Nitrate: 
Tops 
Mean 
3.27±.o73 
4.23 ±.05 
4.i2db.o88 
4-88±.i57 
i.6i±.i73 
6.i9d=.iii 
i.96±.i25 
6.59=b.i22 
2.47±.i50 
4.84±.i53 
6.8i=b.io8 
.62±.i54 
7.95±-i22 
i.36±.i72 
5.97±.i69 
1. 13d:;. 228 
9.03±.454 
2. 22±. 466 
9.59±.347 
i.64±.368 
Roots 
Medium Nitrate: 
Tops 
Diff 
Mean 
Roots 
High Nitrate: 
Tops 
Diff 
Mean 
Roots 
Diff 
Experiment III 
Effect of Nitrates upon Ratio of Tops to Roots in Corn Plants 
In order to get comparative data as to the effects of nitrates, Experiment 
III was conducted with corn. A selected variety of field corn was used. 
The method was practically the same as that used for barley. Three corn 
seedlings were employed to a culture and three cultures constituted a series. 
The first series was removed at the end of 27 days, the second at the end 
of 34 days, and the third at the end of 41 days. Both green and dry weights 
of tops and roots are recorded, as are also the probable errors of the means 
of the dry-weight ratios. It was found practicable in this experiment to use 
two solutions only, the low-nitrate and the medium-nitrate solutions. 
The results are given in table 6. The difference between the ratios of 
tops to roots is not significantly large for the first series; this was true also 
of the first series with barley, and indicates that the seedling is influenced 
more greatly by the composition of the solutions after the tops have begun 
to function actively. The second series, however, gives a difference in 
favor of the medium-nitrate solution of 1.88 it .261, and the third series a 
difference of 3.34 ± .678, as will be seen from the table. 
