SORGHUM EXPERIMENTS ON THE GREAT PLAINS. 
69 
Table 17. — Agronomic data regarding sorghum varieties grown in date-of-seeding 
experiments at Lawton and Woodward, Okla., Dalhart and Big Spring, Tex., and 
T'icumcari, N. Mex., in the 5-year period from 1917 to 1921, inclusive — Contd. 
Yields per acre. 
Station, variety, and 
approximate date 
1917 
1918 
1919 
1920 
1921 
Average. 
Average. 
of seeding. 
© 
a 
o 
a 
I 
o 
'5 
I i 
o g 
Be, 1 3 
3 
c 
a 
S 
O 
O 
a 
6 
S3 
u. 
O 
En 
a 
■— 
O 
'Z 
- 
c 
OS 
a 
Dalhart, Tex.: 
Sumac — 
May 1 
Mav 15. .. _. 
Tons 
Bush. 
Tons 
Bush. 
Tons\Bush. 
6. 54 16. 6 
6. 20 17. 1 
7.68 
Tons 
5.28 
4.93 
4.25 
5.63 
3.13 
3.05 
Bush. 




23.2 
1Q fi 
Tons 
3.69 
3 59 
Bush. 
26.1 
IK 4. 
Tons 
5.17 
i. Ql 
Bush. 
14.2 
in a 
In. 
79 
79 
80 
70 
84 
92 
Days. 
June 1 
June 15 

7.46 
2.94 
3.34 
3.53 
3.06 
5.55 
18. 21 6. 55 6. 1 
35.1 2.94! 29.6 
37. 7 3. 05 27. 
Eed 'Amber- 
May 1 
May 15 


2.75 
2.75 
3.28 
3.08 
S. 16 
9.20 
10.70 
8.80 
7.39 
7.20 
4.90 
4.22 
5. 45 
5.03 
30.4 
23.6 
23.2 
21.4 
114 
June 1 _ 
2. 98l 27. 9 
3. 00 17. 3 
0) 
(i) ' 
94 92 
80 86 
80 122 
79 130 
June 15 
Big'Spring, Tex.: 
Sumac — 
April 15 
May 1. 
'"" 
::::::::::: 
zz 
31.7 
3. 05 23. 5 
6.86 
May 15 
(0 j 
7.00 
7.25 
7.40 
...... c, !...... 
m L 
r») 
80 116 
June 1 
June 15 
July 1 
Red Amber- 
April 15 
May 1 
4.06 
2.92 
2.42 
2.80 
0) 
P) 
2.01 
1.30 
1.00 
.::::: 
6.62 
5.85 
5.67 
3.85 
69 134 
68 120 
74 110 
83 106 
84 92 
May 15 
20 
:0 

20 
20 


-- 
« | 
3.20 
82 98 
June 1 
3 41 
fifi fir, 
June 15 
July 1..-- 

— 

• 

3.89 
2 45 
2.90 
1.90 
...-J 2.70 58 105 
1 78 fU QQ 
T^cumcari, N. Mex.: 
Sumac- 
April 15 
20 
20 
20 
2.84 
4.31 
(') 
20 
20 
20 
1.51 
2.67 
3.18 
20 
20 
20 



20 
20 
2 
( 3 ) 
( 3 ) 
51.35 
51.28 
5.75 
5.35 
.30 
.25 
.65 
( 3 ) 
( 3 ) 










20 
20 
2.20 
2.20 
3.55 
2.00 
20 
20 
1.95 
2.60 
1.85 
1.80 



May 1 
May 15 
June 1 
June 15 
July 1 
Red Amber- 
April 15 
Mav 1 
3.69 
3.84 
2.94 
1.85 
5.9 



( 6 ) 
4.15 
4.00 
1.-81 
( 6 ) 
23.0 
5.4 

1.81 2.0 
2. 86 5. 8 
3.11 1.4 
1.50 
.10 
149 
7 80 131 
"71 121 
"63 112 
.08 
May 15 
1.46 
1.36 
1.10 
.96 
14.7 
1. 02 4. 9 
*66 119 
June 1 
June 15 
Julv 1 
10. 81 . 70 
24. li .98 
25.2 .48 
1 
13.2 
10.3 
7.. 
::::::::::: 
1.54 8.0 '72 116 
1.65 11.5 *69 110 
1.61 11.0 5 71 103 
..... 
: Seeding not made because soil was too dry. 
- Seeded, but blown out. 
j No Sumac seed on hand to plant until May 15. 
* Yield omitted because of error in weight. 
5 Green weight divided by two. 
6 Too wet to plant until June 1 
' Average of 1917 and 1921 only. 
8 Height reported only in 1917 and 1920. 
EFFECT OF THE DATE OF SEEDIXG OX THE RATE OF GROWTH. 
Studies were made at Chillicothe, Tex., in 1916 and 1917 to deter- 
mine what effect the date of seeding had on the growth rate of the 
sorghums as measured by the height attained at 10-dav periods. 
Freed sorghum, Sumac sorgo, Blackhull kafir, Dwarf milo, and fet- 
erita were used in these experiments in order that the response of 
both early and late varieties might be noted. The results obtained 
in 1916 are shown in graphic form in Figure 21. The 1917 results 
were so nearly like those of 1916 that it was not thought necessary 
to present a graph for each. 
The rate of growth for all the varieties is progressively more rapid 
as the date of seeding becomes later. This tendency is most marked 
in the earliest two varieties, Freed sorghum and feterita. For the 
Freed to reach a height of 52 inches the April 10 seeding required 
86 days; April 19, 73 days: May 2, 59 days; May 15, 57 (lays; June 
