July 22 , 1918 
Salt Requirements for Buckwheat Plants 
167 
yields, while the cultures which yielded the lowest dry weights of tops 
gave also minimum root yields. It will further be observed that the 
diagrams graphically representing the dry weights of tops (fig. 1) and 
the corresponding ones representing the relative yields of roots, show a 
very pronounced similarity with respect to the positions and ranges which 
the areas of high and low yields occupy on the diagrams. 
(b) Comparison op the ranges op the ion ratio vaeues por high 
and por now YiEEDS OP roots. —The cation ratio values of the nine cul¬ 
tures producing the best yields of roots, and also the group of nine 
cultures giving the poorest yields, and the ranges of these values for each 
of the two series here considered, are presented in Table IV, which con¬ 
forms in every respect to Table III. As in the case of top yields, the ion 
ratio values for the best nine and the poorest nine cultures in each of the 
two series are limited to certain ranges of these ratio values, which are 
always less extensive than the corresponding total ranges for the entire 
series. 
Table IV .—Comparison of ion ratio values of cultures producing high and low yields 
(best nine and poorest nine cultures) of buckwheat roots during the early period of growth 
(series A) with corresponding data for cultures grown during the late growth period 
(series B) 
Series A (early growth period). 
Series B (late growth period). 
Culture No, 
Mag¬ 
nesi¬ 
um : 
calci¬ 
um. 
Mag¬ 
nesi¬ 
um: 
potas¬ 
sium. 
Calci¬ 
um : 
potas¬ 
sium. 
Culture No. 
Mag¬ 
nesi¬ 
um : 
calci¬ 
um. 
Mag¬ 
nesi¬ 
um: 
potas¬ 
sium. 
Calci¬ 
um : 
potas¬ 
sium. 
High yields: 
R4C1. 
R5C1. 
R2C2. 
R6C1. 
R4C2. 
R2C3. 
R2C4. 
R3CS. 
R2C6. 
Range. 
Eow yields: 
R1C4. 
R8C1.. . 
R5C3. 
R7C2. 
r6c 3 . 
R- 5^4 . 
R4C5. 
R1C8. 
R3C6. 
Range. 
Entire series: 
Maximum. 
Minimum. 
Range. 
9. 61 
7. 70 
5 - 77 
5 - 77 
3.85 
3. 21 
1. 92 
• 77 
. 64 
I. 74 
I. II 
4 - 17 
.69 
i -39 
3 * 47 
2.77 
*93 
i- 39 
O. 18 
. 14 
• 72 
. 12 
.36 
I. 08 
I. 44 
1. 20 
2. l6 
High yields: 
R3C3. 
R4C3. 
R3C4. 
R3C5. 
R6c 3 . 
R1C7. 
RS c 4 . 
R3C6. 
R1C8. 
Range_ ..... 
Eow yields: 
R1C1. 
R2C1.. 
R4C1. 
R5C1. .. 
R1C2..... 
R6C1 . 
R1C3. 
R7C1. 
R1C6. 
Range. 
2. 56 
I. 92 
1.44 
•77 
.64 
•55 
.48 
•32 
.24 
1.85 
1. 04 
i- 39 
•93 
•23 
2. 78 
.28 
.46 
39 
O. 72 
•54 
.96 
1.20 
• 36 
5.04 
• 58 
1.44 
5 - 76 
8. 97 
3 - 48 
I. 32 
2. 32 
2- 55 
5-40 
2 . 40 
I. 92 
I. 28 
.96 
.64 
.48 
*38 
. 24 
•32 
6.95 
. 18 
•56 
. 20 
•23 
.28 
•35 
1* 39 
.46 
2. 88 
.09 
•43 
. 20 
•36 
■ 5 * 
.90 
5 - 76 
1.44 
IS-40 
13- 46 
9. 61 
7.70 
6. 74 
5 - 77 
3-85 
3-85 
.96 
11.10 
4. 86 
1. 74 
1. 11 
9. 72 
. 69 
8. 34 
.40 
4 - 17 
.72 
•36 
. 18 
. 14 
1.44 
. 12 
2. 16 
. 10 
4-32 
2. l6 
6.77 
5 - 67 
14-44 
10. 70 
4. 22 
IS. 40 
. 24 
15. l6 
11. 10 
. 18 
10. 92 
5 - 76 
.09 
5 - 67 
57667°—18 - 2 
