724 
Journal of Agricultural Research 
Vol. XX T, No. io 
culture T3R1C5, marking the lower limit in the range of high top yields, 
appears also in an area representing high root yields. 
From the distribution of the areas representing high yields of tops 
and roots on the diagrams of figures 8 and 9, it is at once apparent that 
good growth may be correlated with relatively wide ranges in the propor¬ 
tions of most of the salts comprised in the culture solutions of the two 
series here considered, but for ammonium-sulphate a narrow range only 
is indicated. This is brought out best by the data in Table IX, which 
gives the volume-molecular partial concentrations of the sails and the 
ranges of these for the culture solutions in each series which produced 
the best six yields of tops and of roots. At the bottom of this table are 
given the maximum and minimum partial concentrations of each salt 
used and the total ranges of these for the entire series. The partial con¬ 
centrations of the culture solutions which produced maximum yields in 
each series appear in bold-face type. The cultures comprised in the 
table are those which are included in the areas of high yields of tops and 
roots on the diagrams of figures 8 and 9. 
Table) IX.— Volume-molecular partial concentrations and ranges of these for the salts 
in the solutions producing the highest six yields of tops and roots in the Tottinqham 
series and in the ammonium-sulphate series 
Culture No. 
Tottinglmm Scries (experiment II). 
Culture 
Ammonium-sulphate series (experi¬ 
ment I). 
1 
No 
-- 
- - — 
KNOs. 
kh 2 po<. 
Ca(N 0 3 ) 2 . 
MgSCh. 
(NHO2SO4. 
KII2P04. 
Ca(N 0 3 )j. 
MgSOi. 
Tops 
(T1R1C3... 
Ti R3C3. .. 
T3R1C6... 
T3R3C1... 
T3R5C1... 
T6R3C1. . . 
0. 0020 
.OOGO 
. 0020 
. 0060 
. 0100 
. 0060 
0. 0021 
.0021 
• 0063 
. 0063 
. 0063 
. 0106 
0. 0044 
.0041 
. 0073 
. 0015 
. 0015 
. 0015 
0. 01x9 
.0071 
. 0024 
. 0071 
. 0024 
. 0024 
T1R1C3 
T1R1C5 
Ti R3C5 
T3R1C3 
T3R3C1 
T5R1C1 
0. 0014 
.0014 
. 0042 
. 0014 
. 0042 
. 0014 
0. 002 r 
.0021 
. 0021 
. 0063 
. 0063 
. 0106 
0. 0044 
.0070 
• 0073 
. 0044 
. 0015 
• 0015 
0. 0119 
.0071 
. 0024 
. 0071 
. 0071 
. 0071 
Range.. 
. 0080 
. 0085 
. 0058 
• 0095 
. 0028 
. 0085 
. 0058 
• C095 
Roots 
(T1R1C3. .. 
T1R3C3. . . 
Ti R?Cr,. . . 
T1R5C3. . . 
T3R1C3. . . 
IVRiCj. . . 
. 0020 
. 0060 
.(1060 
. CIOO 
. 0020 
. 0020 
. 0021 
. 0021 
.0021 
. 0021 
. 0063 
. 0063 
. 0044 
. 0044 
.0073 
. 0044 
. 0044 
• 0073 
. 0119 
. 0071 
.0021 
. 0024 
• 0071 
. 0024 
T1R1C3 
T1R1C-, 
TiRnCs 
T3R1C1 
T3R1C3 
T3 R3C1 
.0014 
. 0014 
. 0042 
. 0014 
. 0014 
. 0042 
.0021 
. 0021 
. 0021 
. 0063 
. 0063 
. 0063 
.0011 
• 0073 
• 0073 
.0013 
. 0044 
.0015 
.0110 
. 0071 
. 0024 
. 0119 
. 007 X 
. 0071 
Range.. 
. 0080 
. 0042 
. 0029 
• 0095 
. 0028 
. 0042 
. 0058 
• 009s 
Entire series: 
Maximum. 
Minimum . 
. 0140 
• 0020 
. 0148 
. 0021 
. 0102 
• 0015 
. ox66 
• 0024 
. 0098 
. 0014 
. 0148 
. 0021 
. 0102 
. 0015 
. 0166 
. 0024 
Range. 
. 0120 
.0x27 
• 0087 
. 0142 
. 0084 
.0127 
. 0087 
• 0x42 
Inspection of the data in Table IX shows that the salt proportions 
characterizing the cultures which gave the highest six yields of lops and 
roots in the two series are limited to certain ranges in these proportions 
which are always less extensive than the total ranges for the entire 
seiies. llie range in the proportions of each salt which produced high 
yields of tops in the Tottingham series is relatively wide, in each instance 
being approximately two-thirds of the total range of these proportions 
