July ss, i 9 is ‘ Salt Requirements for Buckwheat Plants 
163 
TabliS 111 .—Comparison of ion ratio values of cultures producing high and low yields 
{best nine and poorest nine cultures) of buckwheat tops during the early period of growth 
(senes A) with corresponding data for cultures grown during the late period of growth 
Series A (early growth period.) 
Series B (late growth period). 
Culture No. 
Magne¬ 
sium: 
cal¬ 
cium. 
Magne¬ 
sium : 
potas¬ 
sium. 
Cal¬ 
cium : 
potas¬ 
sium. 
Culture No. 
Magne¬ 
sium : 
Cal¬ 
cium. 
Magne¬ 
sium: 
potas¬ 
sium. 
Cal¬ 
cium: 
potas¬ 
sium. 
High yields: 
R2C1. 
R3C1. 
R4C1. 
R5C1. 
R2C2. 
R3C2. 
R4C2. 
R2C4. 
R3CS. 
Range. 
Low yields: 
R7C1. 
* R1C4. 
R8C1. 
R3C4. 
R5C3. 
R7C2.. 
R6c 3 . 
R4C5. 
R3C6. 
Range. 
Entire series: 
Maximum. 
Minimum. 
Range. 
13.46 
“• ss 
9. 61 
7.70 
5 - 77 
4. 81 
3 . 85 
i. 92 
• 77 
4. 86 
2. 87 
I. 74 
1. II 
4 - 17 
2. 32 
1. 39 
2. 77 
•93 
O. 36 
. 24 
. 18 
• 14 
■ 72 
. 84 
.36 
1. 44 
I. 20 
High yields: 
R2C2. 
R3C2. 
R4C3. 
R3C4. 
R4C4. 
R3C5. 
R1C7. 
R3C6. 
R1C8 
Range.... 
Low yields: 
R1C1. 
R2C1. 
R3C1. 
R4C1. 
R5C1. 
R6C1. 
ric 3 . 
R1C6. 
R4C5. 
Range. 
5-77 
4. 81 
1. 92 
1. 44 
.96 
.77 
• 55 
•32 
.24 
4. 17 
2. 32 
1. 04 
*• 39 
.69 
• 93 
2. 78 
.46 
*• 39 
O. 72 
. 84 
• 54 
.96 
. 72 
I. 20 
5 - 04 
1.44 
5 - 76 
12. 69 
3 - 93 
I. 30 
5 - S 3 
3 - 7 i 
5. 22 
3 - 85 
2. 40 
1. 92 
1.44 
1. 28 
.96 
.64 
.38 
•32 
.40 
6-95 
. 18 
*• 39 
• 
. 20 
• 2 3 
•35 
.46 
. IO 
2.88 
.09 
.96 
•43 
. 20 
•36 
. 90 
1.44 
15 40 
13 * 46 
55 
9. 61 
7.70 
5 - 77 
3 -ss 
. 96 
• 38 
II. IO 
4. 86 
2. 76 
74 
1. 11 
69 
8. 34 
4. 17 
•35 
.76 
•36 
. 24 
, 18 
• 14 
. 12 
2. 16 
4.32 
.90 
3 - 53 
6. 77 
2. 79 
15. 02 
IO - 75 
4. 20 
15.40 
.24 
[5. 16 
II. IO 
. 18 
10. 92 
5 - 76 
. 09 
5 - 67 
The cultures R4C2 and R3C5, which produced the highest yields of 
tops in series A and series B, respectively, agree in showing relatively 
low values for all three cation ratios, although there is considerable dif¬ 
ference between the corresponding ratio values for the two cultures. 
The values of the three ratios magnesium to calcium, magnesium to potas¬ 
sium, and calcium to potassium for the culture (R4C2) producing the 
maximum yield of tops in series A are 3.85, 1.39, and 0.36, respectively, 
while the corresponding ratio values for the culture (R3C5) which pro¬ 
duced the highest yield in series B are 0.77 y °* 93 > find 1.20, respectively. 
On comparing now the ranges in the ratio values as given in Table III 
for low yields it will be observed that there is no agreement between the 
groups of cultures producing low dry weights in the two different series, 
with respect to the ranges in the magnitudes o£ any two corresponding 
ratios. Thus, the group of cultures of series A giving low yields of tops 
is characterized by a relatively low range of values for the ratio mag- 
