16,6 
Espino: Salt Requirements of Young Rice Plants 473 
where they could be drawn as equilateral without distortion. 
The different sets of molecular salt proportions will be named 
by formulas similar to those employed by Tottingham, the letter 
S being here used in place of the C in his formulas. TIRISI 
is the solution (or set of salt proportions) represented by the 
lower front apex of the diagram ; T1R2S4 is the one represented 
by the fourth point, counting from the left, in the second row 
from the front of the lowest triangle; T3R1S2 is represented 
by the second point, counting from the left, in the front row 
of the third triangle from the bottom; T5R1S1 is represented 
by the top apex of the tetrahedron (since the fifth triangle has 
but a single point), etc. In this diagram every solution of the 
lowest triangle has one-eighth of its total molecular concentra- 
Table 2. — Descriptions of stock culture solutions of J^-salt types A and B 
{A, with both ammonium and nitrate; B, without nitrate).^ 
[Total concentration, 0,0384 Bram-molecule (of all salts taken together) per liter.] 
Solution No. 
Molecu- 
lar salt 
propor- 
tions 
KH2PO4 
(NH<)2 
S04Ca 
(N0 s) 2 
MgS04. 
Volume 
of molec- 
ular par- 
tial con- 
centra- 
tion of 
KH2PO4 
Solution No. 
Molecu- 
lar salt 
propor- 
tions 
KH2PO4 
(NH4)2 
S04Ca 
(NOs) 2 
MgS04. 
Volume 
of molec- 
ular par- 
tial con- 
centra- 
tion of 
KH2PO4. 
T1R1S1-— 
T2RIS1 
2:1:1:4 
S2 
1:1:2:4 
S2 
2:l:2:3 
S3 
1:1:8:3 
SS 
2 : 1 ; 3 : 2 
^ S4 
1:1:4:2 
84 
2 ; 1 : 4 ; 1 
S5 
R2Sl-.._ 
2:2:1;3 
R2S1 
1:2:1:4 
S2 
2:2:2;2 
S2 
1:2:2:S 
S3 
2:2;3:1 
0.0096 
S3 
1:2:3:2 
R3S1 . . 
2:3:1:2 
0.0048 
S4 
1:2:4:1 
S2 
2:3:2:1 
R3S1 
1:3:1:3 
R4S1 
2;4;1:1 
S2 — 
1:3:2:2 
T3R1S1 
3:1:1:3 
S3 
1:3:3:1 
S2 
3;1:2:2 
R4S1 
1:4:1:2 
S3 
3 : 1 : 3 : 1 
S2 
1:4:2:1 
R2S1 
3:2:1:2 
0. 0144 
RBSl 
S2 
3:2:2;1 
R3S1 
3:3:1;1 
T4R1S1 
4:1:1:2 
S2... 
4:1:2;1 
0. 0192 
R2S1 
4:2:1:1 
T6R1S1 
0.0240 
> The salts named are those of type A ; for t3rpe B, monocalcium phosphate replaced caleiujn 
nitrate as here giren. 
